Daf Yomi
Chullin 80
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The legal and ontological boundaries of animal categorization in Jewish law are tested at Chullin 80a. The Gemara here grapples with the status of the koy (כוי)—a hybrid animal or a distinct, unclassified species—and the "forest goats" (izei devala).
┌───────────────────────────┐
│ Ontological Status of │
│ the Koy │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Genetic Hybrid │ │ Sui Generis Species │
│ (Goat x Doe / Deer x Goat)│ │ (Wild Ram / etc.) │
└────────────┬──────────────┘ └────────────┬──────────────┘
│ │
├──────────────────────────────┐ │
▼ ▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐┌───────────────────────────┐
│ Paternal Descent │ │ Genomic Sufficiency ││ Absolute Taxonomic │
│ (Chayshinan l'zera ha'av) │ │ (Seh v'lo miktzat seh) ││ Skeptics │
└───────────────────────────┘ └───────────────────────────┘└───────────────────────────┘
The discussion yields several key areas of inquiry:
- The Taxonomic Status of the Koy: Is the koy an independent biological entity (berya bifnei atzmah) or a hybrid resulting from the crossbreeding of a domesticated goat (behemah) and a wild doe (chaya)?
- Genomic Sufficiency in Ritual Law (Seh v'lo miktzat seh): Does the Torah's use of the term "sheep" (seh) require a genetically pure lineage, or does partial sheep ancestry suffice to trigger obligations like the priestly gifts (matnot kehunah) and the prohibition of slaughtering an animal and its offspring on the same day (oto v'et bno)?
- The Paternity Question (Chayshinan l'zera ha'av): Does halakhic taxonomy recognize paternal genetic contribution, or is maternal lineage exclusively determinative?
- The Taxonomy of Wild Goats (Izei Devala): Are wild forest goats classified as a sub-species of the domesticated goat (permitting their sacrifice on the Altar but forbidding their suet, chelev) or as a wild beast (exempting them from the Altar but permitting their fat)?
- The Nature of Sacrificial Slaughter (Shechitah she'eina ra'uya): Does an invalid act of slaughter (e.g., slaughtering consecrated animals outside the Temple courtyard) retain the formal halakhic designation of "slaughter" regarding secondary prohibitions like oto v'et bno?
Nafka Minot (Halakhic Ramifications)
- Covering the Blood (Kisuy HaDam): If the koy is a chaya (wild beast), its blood must be covered; if it is a behemah (domesticated animal), it is exempt. If it is a hybrid, it occupies a state of halakhic doubt (safek), requiring covering without a blessing.
- Priestly Gifts (Matnot Kehunah): Domesticated animals require giving the shoulder, cheeks, and maw to the Kohen Deuteronomy 18:3. Wild animals are exempt.
- The Prohibition of Oto V'et Bno: Does the prohibition of slaughtering a mother and its young on the same day Leviticus 22:28 apply when one or both of the animals are hybrids?
- Altar Suitability (Kasher l'Mizbe'ach): Can forest goats be offered as sacrifices, which requires them to fall under the category of behemah?
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Text Snapshot
The Gemara's analysis of the tannaitic dispute between Rabbi Eliezer and the Sages regarding the definition of seh (sheep/goat) hinges on the precise syntax of Rav Pappa's formulation:
אמר רב פפא: הלכך, לענין כסוי הדם ומתנות לא משכחת לה אלא בצבי הבא על התיישה. דבין לרבנן ובין לרבי אליעזר ספוקי מספקא להו אי חוששין לזרע האב אי אין חוששין לזרע האב, והכא ב"שה" ואפילו מקצת שה קמיפלגי.
Textual and Grammatical Analysis
- "הלכך" (Therefore): Rav Pappa uses this logical connector to bind the abstract tannaitic dispute over the word seh (found in the context of firstborn animals or oto v'et bno) to the concrete, unresolved doubts concerning the koy.
- "שה ואפילו מקצת שה" (A sheep, and even a partial sheep): The noun seh is treated not as a binary biological switch, but as a scale of legal definitions. The Sages (Rabban) read the biblical term expansively: any animal possessing a genomic "fraction" (miktzat) of sheep-identity is subject to the laws of sheep. Rabbi Eliezer reads it restrictively: seh gamur (a complete sheep) is required, excluding any hybrid.
- "ספוקי מספקא להו" (They are in a state of doubt): Rav Pappa makes a striking interpretive move here. He does not attribute a decisive, polarized dispute to the Tannaim regarding paternal descent (chayshinan l'zera ha'av). Instead, he asserts that both Rabbi Eliezer and the Sages are in a state of structural doubt regarding paternity. Their active dispute is restricted to the secondary question: if paternity does transfer identity, does a partial identity satisfy the term seh?
Readings
The Rishonim and Acharonim split on how to resolve the biological, hermeneutical, and conceptual problems raised by Rav Pappa's framework.
Reading 1: Maharam Schiff — The Structural Necessity of Rabbi Eliezer's Doubt
The Maharam Schiff[^1] addresses a structural vulnerability in Rav Pappa's presentation of Rabbi Eliezer's position.
┌──────────────────────────────────────────────┐
│ Why does Rav Pappa cast │
│ Rabbi Eliezer in a state of │
│ Halakhic Doubt? │
└──────────────────────┬───────────────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Hypothetical Path │ │ Rav Pappa's Path │
│ "Certain Paternity" │ │ "Doubting Paternity" │
└────────────┬──────────────┘ └────────────┬──────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ If certain, R. Eliezer │ │ Maintains the status of │
│ exempts from oto v'et │ │ koy as an absolute │
│ bno outright. │ │ safek (Yom Tov issue). │
└────────────┬──────────────┘ └────────────┬──────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Fails to explain why a │ │ Successfully accounts │
│ koy cannot be slaughtered│ │ for the restrictive Yom │
│ on Yom Tov. │ │ Tov slaughter laws. │
└───────────────────────────┘ └───────────────────────────┘
The Gemara could have argued that Rabbi Eliezer holds certainly that we fear paternal descent (vadai chayshinan l'zera ha'av). If so, a deer that mates with a female goat produces an offspring that is half-deer and half-goat. Rabbi Eliezer, holding seh v'lo miktzat seh (only a whole sheep, not a partial sheep), would exempt this hybrid from priestly gifts and oto v'et bno because of its paternal deer identity. Why does Rav Pappa insist that Rabbi Eliezer is in a state of doubt (safek) regarding paternity?
The Maharam Schiff explains that Rav Pappa's hand was forced by the wider tannaitic context. If Rabbi Eliezer held certainly that we concern ourselves with paternity, the koy (conceived from a deer and a goat) would be a definitive hybrid. If so, why does the Mishnah in Chullin 83b rule that we do not slaughter a koy on Yom Tov because of the doubt regarding kisuy hadam? If its status were certain, its halakhic obligations would be clear.
By defining Rabbi Eliezer's position as a state of doubt regarding paternity, Rav Pappa preserves the status of the koy as an unresolved safek across all halakhic areas. This maintains the integrity of the Yom Tov prohibition, which is rooted in this doubt.
[^1]: Maharam on Maharam on Chullin 80a:1.
Reading 2: Rashi and Tosafot — Biological Hybrids vs. Independent Species
A deep debate exists regarding the physical reality of the koy. Is it a hybrid or a distinct animal?
┌───────────────────────────┐
│ Ontology of the Koy │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Rashi │ │ Tosafot │
│ (Sui Generis Species) │ │ (Biological Hybrid) │
└───────────┬───────────────┘ └───────────┬───────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ • Nature cannot cross │ │ • Crossbreeding is a │
│ the chaya/behemah │ │ biological reality. │
│ boundary. │ │ • R. Eliezer & Sages are │
│ • R. Eliezer & Sages are │ │ debating the actual │
│ debating a theoretical │ │ hybrid offspring of │
│ mental construct. │ │ a goat and a doe. │
└───────────────────────────┘ └───────────────────────────┘
Rashi[^2] comments on Rav Yehuda's statement that "the koy is a distinct entity" (berya bifnei atzmah hi). He notes that Rav Yehuda rejects the view that the koy is a hybrid of a deer and a goat. Rashi explains the biological assumption behind this: "For they hold that a wild beast (chaya) cannot become pregnant from a domesticated animal (behemah), nor a domesticated animal from a wild beast."
According to Rashi, there is a natural, biological barrier between chaya and behemah. Therefore, the koy discussed in the Mishnayot must be an independent, third-category species whose physical features are ambiguous. When Rav Pappa sets up a dispute regarding a "deer that mates with a female goat," he is analyzing a theoretical case or a rare exception, whereas the koy of our Mishnah is a distinct, non-hybrid species.
Tosafot[^3] challenges Rashi's biological assertion. They note that the Gemara in Bava Kamma 78b openly discusses the hybrid of a goat and a doe as a practical reality. Tosafot argues that crossbreeding between chaya and behemah is biologically possible.
The dispute between Rav Yehuda (who says the koy is a distinct species) and the Sages (who say it is a hybrid) is not a debate about the limits of nature, but a taxonomic classification of the specific creature called koy. Tosafot asks: if the koy is a distinct species, why can we not resolve its status by examining its horns? The Gemara in Chullin 59a provides clear criteria for distinguishing the horns of a chaya (which must be split, rounded, and notched) from those of a behemah.
Tosafot answers that the koy's horns are intermediate or ambiguous, meaning they cannot be classified using these criteria. This leaves its status unresolved.
[^2]: Rashi, Chullin 80a, s.v. "Berya bifnei atzmah". [^3]: Tosafot, Chullin 80a, s.v. "Koy berya bifnei atzmah hi".
Reading 3: Rav Chaim Soloveitchik — The Metaphysics of "Unfit Slaughter" (Shechitah She'eina Ra'uya)
The Gemara discusses Rabbi Shimon's famous principle: Shechitah she'eina ra'uya lo shemah shechitah—an act of slaughter that does not permit the animal for consumption is not legally considered "slaughter." This principle is used to analyze the Mishnah's cases of slaughtering sacrificial animals outside the Temple (shechutei chutz) or inside the Temple without proper sprinkling of the blood.
┌───────────────────────────┐
│ Shechitah She'eina Rauya │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ The Sages' View │ │ Rabbi Shimon's View │
└───────────┬───────────────┘ └───────────┬───────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ • Slaughter is a formal │ │ • Slaughter is a goal- │
│ action (cutting the │ │ directed process. │
│ simanim). │ │ • Without the outcome of │
│ • Legal status is │ │ permissibility, the │
│ independent of dietary │ │ action is legally │
│ permissibility. │ │ meaningless. │
└───────────────────────────┘ └───────────────────────────┘
Rav Chaim Soloveitchik[^4] analyzes the mechanism of Rabbi Shimon's rule. Is shechitah she'eina ra'uya a flaw in the physical act of slaughter (ma'aseh shechitah), or is it a failure in the resulting legal status (chalut shechitah)?
- The Sages' View: Slaughter is a formal, physical action defined by cutting the trachea and esophagus (simanim). Once this action is performed, the legal status of "slaughtered" is established, regardless of whether the meat is kosher or permitted for consumption.
- Rabbi Shimon's View: Halakhic slaughter is a goal-directed process. Its legal definition is tied to its output—making the animal fit for consumption (ra'uy l'achilah). If a secondary factor (such as a blemish, a sacrificial disqualification, or the prohibition of shechutei chutz) prevents the meat from being eaten, the physical act of cutting the simanim is stripped of its halakhic status. It is viewed as mere killing (nehargah), not ritual slaughter (shechitah).
Rav Chaim uses this distinction to explain why, according to Rabbi Shimon, one who slaughters a mother and its offspring outside the Temple is exempt from the prohibition of oto v'et bno. Because the first slaughter was performed outside the Temple, the meat is forbidden. It is an "unfit slaughter."
Therefore, the first act is not halakhically considered slaughter. As a result, the second act does not constitute slaughtering the "offspring after the parent," since the parent was never legally "slaughtered" in the first place.
[^4]: Chiddushei Rabbeinu Chaim HaLevi, Hilchot Ma'achalot Assurot 4:1.
Reading 4: Ameimar — The Kashrut of Forest Goats (Izei Devala)
The Gemara discusses the classification of "forest goats" (izei devala). Rav Hamnuna argues they are fit for the Altar because they are a sub-species of domesticated goats (iz).
He bases this on a closed list of seven kosher wild beasts (chaya) listed in Deuteronomy 14:4-5. Since forest goats are not on that list, they must be classified as domesticated animals (behemah).
┌───────────────────────────┐
│ Status of Forest Goats │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Rav Hamnuna │ │ Ameimar │
│ (Domesticated / Behemah)│ │ (Wild / Chaya) │
└───────────┬───────────────┘ └───────────┬───────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ • Fit for the Altar. │ │ • Unfit for the Altar. │
│ • Suet (chelev) is │ │ • Suet (chelev) is │
│ strictly forbidden. │ │ permitted. │
└───────────────────────────┘ └───────────────────────────┘
Ameimar disagrees, permitting the consumption of their suet (chelev). This ruling demonstrates that he classifies them as wild beasts (chaya), whose fat is permitted Leviticus 7:25.
How does Ameimar address Rav Hamnuna's proof from the closed list of seven wild beasts?
The Rashba[^5] explains that Ameimar does not view the list in Deuteronomy as an exhaustive taxonomic list of distinct species. Instead, he reads the verses using the hermeneutical rule of Klal u'Prat u'Chlal (a general statement, followed by detailed specifications, followed by a general statement):
- Detail: "The deer, the gazelle, and the fallow deer..." Deuteronomy 14:5
- Generalization: "...and every beast that parts the hoof..." Deuteronomy 14:6
Under this interpretive rule, the list of seven animals serves as examples of the broader category of wild beasts. Any wild animal that possesses the required physical markers (split hooves and chewing the cud) is classified as a chaya.
The forest goat, with its wild behavior and distinct traits, is classified as a chaya. Consequently, its fat is permitted, and it cannot be offered on the Altar.
[^5]: Rashba, Chullin 80a, s.v. "Ameimar sharei chelvaihu".
Friction
Kushya: The Paradox of Shechutei Chutz under Rabbi Shimon
The Gemara analyzes the Mishnah's case where both the parent animal and its offspring are consecrated sacrifices (kodashim), and a person slaughters both of them outside the Temple courtyard on the same day.
- The Mishnah rules: For the first animal, he is liable to excision (karet) for slaughtering a sacrifice outside the Temple Leviticus 17:4. For the second animal, he is liable to forty lashes for violating oto v'et bno.
- The Gemara objects: This Mishnah cannot follow Rabbi Shimon. According to Rabbi Shimon, shechitah she'eina ra'uya lo shemah shechitah. The first animal was slaughtered outside the Temple, making its meat forbidden for consumption. Thus, its slaughter is "unfit" and cannot legally be considered "slaughter."
- If the first act was not a legal slaughter, then when the person slaughters the second animal outside, that second act should be the first valid legal slaughter of a sacrifice outside. Therefore, the person should be liable to karet for the second animal as well! Why does the Mishnah rule that he is only liable for oto v'et bno?
Mishnah Case:
[Animal 1: Consecrated] ── Slaughtered Outside ──> Violates Shechutei Chutz (Karet)
[Animal 2: Offspring] ── Slaughtered Outside ──> Violates Oto V'et Bno (Lashes)
The Paradox under Rabbi Shimon:
If Slaughter 1 is "Unfit" (Eina Rauya) ──> It is legally non-existent.
Therefore:
Slaughter 2 is the first actual "Slaughter."
Result:
Why no Karet on Animal 2?
Terutz A: The Ritva's Duality of "Slaughter"
The Ritva[^6] resolves this by distinguishing between the definition of "slaughter" for the prohibition of shechutei chutz and the definition of "slaughter" for the permission of consumption.
The prohibition of shechutei chutz is not triggered by a "successful" ritual slaughter that permits meat. It is a prohibition against performing a sacrificial act outside the Temple. The Torah prohibits the act of offering or slaughtering a consecrated animal in the wrong place.
Therefore, even according to Rabbi Shimon, the first act is considered a "slaughter" regarding the laws of shechutei chutz, triggering the liability of karet. It is only regarding the internal laws of shechitah (such as permitting meat or triggering oto v'et bno) that we say lo shemah shechitah.
Because the first act was a "slaughter" for shechutei chutz, it uses up the liability of karet for slaughtering outside. The second act cannot trigger karet because the Torah only penalizes the first act of outside slaughter; any subsequent slaughter on the same day is a continuation of an already disqualified state.
Terutz B: The Kehillot Yaakov's "Name of Slaughter" (Shem Shechitah)
The Kehillot Yaakov[^7] offers a conceptual resolution based on the definition of shem shechitah (the designation of slaughter).
┌───────────────────────────┐
│ Kehillot Yaakov's │
│ Resolution │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Physical Action │ │ Halakhic Purpose │
│ (Shem Shechitah) │ │ (Permitting Meat) │
└───────────────┬───────────┘ └───────────────┬───────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ • Present in the first │ │ • Absent in both cases │
│ slaughter outside. │ │ due to outside │
│ • Sufficient to block │ │ slaughter. │
│ the second animal │ │ • Rabbi Shimon focuses │
│ from being the │ │ on the physical act │
│ "primary" slaughter. │ │ for outside liability. │
└───────────────────────────┘ └───────────────────────────┘
He argues that for Rabbi Shimon, shechitah she'eina ra'uya is not physically non-existent; rather, it fails to achieve its halakhic purpose of permitting the meat.
When the first animal is slaughtered outside, the physical action of slaughter is complete. This action is sufficient to establish the liability of shechutei chutz. Because the first animal has been physically slaughtered, the second animal cannot be viewed as the "primary" or "sole" act of slaughter outside.
The second act remains a secondary slaughter. Since it cannot trigger karet, and because it was performed after its parent, it is subject only to the lashes of oto v'et bno.
[^6]: Ritva, Chullin 80a, s.v. "Ela le'olam la tithani". [^7]: Kehillot Yaakov, Chullin, Siman 32.
Kushya: The Epistemological Conflict of Hatra'at Safek (Uncertain Warning)
The Gemara notes that according to Rabbi Eliezer, if a person slaughters a hybrid koy (conceived from a deer and a goat) and its offspring on the same day, they do not receive lashes.
- The Gemara's reasoning: Rabbi Eliezer is in a state of doubt regarding paternity (safek chayshinan l'zera ha'av). This means the koy might be a full sheep (if we do not fear paternity, meaning it follows its maternal goat lineage) or a partial sheep (if we do fear paternity).
- Because of this doubt, any warning given to the transgressor before the act is an "uncertain warning" (hatra'at safek). The warning would be: "Do not slaughter this animal, for it might violate the prohibition of oto v'et bno."
- Under Talmudic law, hatra'at safek lo shemah hatra'ah—an uncertain warning is invalid, and lashes cannot be administered Sanhedrin 80b.
- The Kushya: If hatra'at safek is invalid, how can the Sages ever administer lashes for a koy? The Sages also hold that paternity is a state of doubt (ספוקי מספקא להו). Yet, the Gemara states that according to the Sages, if the koy is the offspring of a deer and a goat, one does receive lashes for slaughtering it and its offspring on the same day!
- If the Sages are also in a state of doubt regarding paternity, why does the warning not fail as a hatra'at safek?
┌─────────────────────────────────────────────┐
│ Why do the Sages permit │
│ lashes despite the doubt │
│ of paternity? │
└──────────────────────┬──────────────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Rabbi Eliezer's Path │ │ The Sages' Path │
└────────────┬──────────────┘ └────────────┬──────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ • Holds "Seh v'lo │ │ • Holds "Seh v'afilu │
│ miktzat seh". │ │ miktzat seh". │
│ • If paternity exists: │ │ • If paternity exists: │
│ exempt (partial). │ │ liable (partial). │
│ • If no paternity: │ │ • If no paternity: │
│ liable (pure). │ │ liable (pure). │
│ • Result: True Safek │ │ • Result: Certainty │
│ (No Lashes). │ │ (Lashes Administered). │
└───────────────────────────┘ └───────────────────────────┘
Terutz: The Mathematical Certainty of the Sages
This paradox is resolved by examining the interaction between the doubt of paternity and the hermeneutical dispute of seh v'afilu miktzat seh.
For the Sages, who hold "שה ואפילו מקצת שה" (a sheep, and even a partial sheep), the doubt regarding paternity does not affect the final liability:
- Scenario A: Paternity is legally significant (chayshinan l'zera ha'av). The koy (from a deer and a goat) is a hybrid—part-deer and part-goat. Since it has partial goat lineage, and the Sages hold seh v'afilu miktzat seh, the animal is classified as a "sheep." Slaughtering it and its offspring violates the prohibition, and the transgressor is liable.
- Scenario B: Paternity is not legally significant (ein chayshinan l'zera ha'av). The animal's identity is determined solely by its mother, a goat. It is a full goat. Slaughtering it and its offspring violates the prohibition, and the transgressor is liable.
Under both scenarios, the transgressor is liable. Therefore, the warning given to him—"Do not slaughter this animal and its offspring, for you will violate oto v'et bno"—is a certain warning (hatra'at vadai). The doubt regarding paternity does not create a doubt regarding the final liability.
For Rabbi Eliezer, who holds "שה ולא מקצת שה" (only a complete sheep, not a partial sheep), the doubt regarding paternity directly affects the final liability:
- Scenario A: Paternity is legally significant. The koy is a hybrid (part-deer, part-goat). Because it is only a partial goat, Rabbi Eliezer's rule of seh v'lo miktzat seh exempts it from the prohibition.
- Scenario B: Paternity is not legally significant. The koy is a full goat. It is subject to the prohibition.
Under Rabbi Eliezer's view, the animal's liability depends on the unresolved question of paternity. This makes any warning given before the act a hatra'at safek, meaning lashes cannot be administered.
Intertext
The taxonomic challenges of Chullin 80a connect to several biblical passages and later halakhic codes.
1. The Biblical Lists of Kosher Animals
┌───────────────────────────┐
│ Biblical Taxonomy │
│ (Deuteronomy 14:4-5) │
└─────────────┬─────────────┘
│
┌───────────────────────┴───────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Behemah (Domesticated) │ │ Chaya (Wild) │
└─────────────┬─────────────┘ └─────────────┬─────────────┘
│ │
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ 1. Ox │ │ 4. Deer 8. Oryx │
│ 2. Sheep │ │ 5. Gazelle 9. Aurochs │
│ 3. Goat │ │ 6. Roebuck 10. Wild Sheep│
└───────────────────────────┘ │ 7. Wild Goat │
└───────────────────────────┘
In Deuteronomy 14:4-5, the Torah provides a list of kosher animals:
"These are the beasts which ye may eat: the ox, the sheep, and the goat, the hart, and the gazelle, and the roebuck, and the wild goat, and the pygarg, and the antelope, and the mountain sheep."
The Gemara in Chullin uses this passage to establish a taxonomic principle: the Torah lists three domesticated species (behemah) and seven wild species (chaya).
This list serves as the basis for Rav Hamnuna's view that any kosher animal not included in the seven wild species must be classified as a domesticated animal (behemah).
This rule is tested by the "forest goats" (izei devala). It highlights a deeper tension in biblical taxonomy: is kosher status determined by membership in a closed list of species, or by general physical markers (split hooves and chewing the cud)?
2. The Codification of the Koy in Shulchan Aruch
The Shulchan Aruch codifies the rules of the koy across several sections of Yoreh Deah, demonstrating how these theoretical doubts are applied in practice.
┌───────────────────────────┐
│ The Koy in Shulchan Aruch│
└─────────────┬─────────────┘
│
┌───────────────────────────────┼───────────────────────────────┐
▼ ▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐ ┌───────────────────────────┐
│ Yoreh Deah 28:4 │ │ Yoreh Deah 80:1 │ │ Yoreh Deah 16:1 │
├───────────────────────────┤ ├───────────────────────────┤ ├───────────────────────────┤
│ • Must cover its blood │ │ • Ambiguity of horns is │ │ • Oto V'et Bno applies │
│ (kisuy hadam) due to │ │ the practical reason │ │ out of doubt. │
│ doubt. │ │ for its unclassified │ │ • No lashes are │
│ • No blessing is recited. │ │ status. │ │ administered. │
└───────────────────────────┘ └───────────────────────────┘ └───────────────────────────┘
- Covering the Blood: In Shulchan Aruch, Yoreh Deah 28:4, the Mechaber rules that because the koy is a state of doubt (safek chaya safek behemah), its blood must be covered after slaughter. However, no blessing is recited over this act. This follows the principle of safek berachot l'hakel (we do not recite blessings in cases of doubt, to avoid a vain blessing).
- The Horn Criteria: In Shulchan Aruch, Yoreh Deah 80:1, the Shulchan Aruch outlines the physical markers used to identify a chaya for the purpose of permitting its fat (chelev). The Rama notes that because the koy's horns are ambiguous, it does not meet these criteria. This leaves its fat forbidden as a matter of doubt.
- Oto V'et Bno: In Shulchan Aruch, Yoreh Deah 16:1, the Shulchan Aruch rules that the prohibition of oto v'et bno applies to the koy out of doubt. If a person slaughters a koy and its offspring on the same day, they are not flogged, but the act is forbidden ab initio (assur l'chatchilah).
Psak/Practice
The discussion in Chullin 80a outlines how halakha addresses cases of taxonomic doubt and genetic hybridity.
1. Resolving Taxonomic Doubt
Halakha does not require absolute biological certainty to establish practical obligations. Instead, it uses restrictive double-binding rules:
$$\text{Status of Koy} = \text{Safek } (\text{Chaya} \lor \text{Behemah})$$
$$\text{Fat (Chelev)} \implies \text{Forbidden (like Behemah)} \quad [\text{Chumra}]$$
$$\text{Blood (Dam)} \implies \text{Requires Covering (like Chaya)} \quad [\text{Chumra}]$$
$$\text{Blessing (Berakha)} \implies \text{Omitted (Safek Berachot L'hakel)} \quad [\text{Kula}]$$
This approach ensures compliance with Torah law while avoiding the recitation of a blessing in vain (berakha l'vatala).
2. The Status of Hybrids in Modern Halakha
The principles established in Chullin 80a regarding genetic transmission (chayshinan l'zera ha'av) and genomic sufficiency (seh v'afilu miktzat seh) remain relevant for modern halakhic authorities.
┌───────────────────────────┐
│ Modern Halakhic │
│ Applications │
└─────────────┬─────────────┘
│
┌───────────────────────────────┴───────────────────────────────┐
▼ ▼
┌───────────────────────────┐ ┌───────────────────────────┐
│ Species Taxonomy │ │ Genetic Engineering │
├───────────────────────────┤ ├───────────────────────────┤
│ • Crossbreeding of │ │ • Splice genes from a │
│ domesticated sheep │ │ non-kosher species │
│ with wild species │ │ into a kosher species. │
│ (e.g., Mouflon). │ │ • Does genetic dilution │
│ • Rules of Chullin 80a │ │ affect kosher status? │
│ determine their status. │ │ • Does "miktzat" apply? │
└───────────────────────────┘ └───────────────────────────┘
- Taxonomic Identification: When wild sheep (e.g., the Mouflon) are crossbred with domesticated sheep, the rules of Chullin 80a are used to determine their status regarding oto v'et bno and Altar suitability.
- Genetic Engineering: Modern authorities use these discussions to analyze the status of transgenic animals. If scientists splice genes from a non-kosher species into a kosher species, does the hybrid animal lose its kosher status?
- Posekim[^8] use the debate between Rabbi Eliezer and the Sages over seh v'lo miktzat seh to analyze this question. They discuss whether genetic modification constitutes "partial lineage" (miktzat) that would affect the animal's halakhic status, or if halakhic taxonomy is determined by the animal's overall physical appearance and maternal birth.
[^8]: Cf. Tzitz Eliezer, Vol. 15, Siman 45; Nishmat Avraham, Yoreh Deah 80.
Takeaway
Halakhic taxonomy is not merely a description of natural biology, but a legal system where legal definitions—such as genomic sufficiency (seh v'afilu miktzat seh)—shape the status of physical creatures. Under this framework, even an animal of doubtful origin or hybrid lineage is assigned a precise set of practical obligations.
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