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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
14/03/2000 |
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Data da última atualização: |
28/04/2023 |
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Autoria: |
ASDELL, S. A. |
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Título: |
Variation in the duration of gestation in the goat. |
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Ano de publicação: |
1929 |
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Fonte/Imprenta: |
Journal Agricultural Science, v. 19, n. 2, p. 382-386, 1929. |
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Idioma: |
Inglês |
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Conteúdo: |
(1) A large series of data on the duration of gestation in the goat has been analysed and the constants calculated. (2) The frequency curve is unimodal and symmetrical, suggesting a single factor or a variety of factors acting simultaneously as the cause for birth. (3) Slight breed differences exist in the duration of gestation in the goat as in other species examined. (4) There is a continuous variation in the duration of gestation with the time of year at which conception occurs. Spring conceptions give shorter gestations than autumn conceptions. (5) There is a distinct difference in the duration of gestation for young and older dams. This is related to the age of the dams and not to the order of the births. Gestation is shorter in the young animal than in the older. (6) In the goat the size of litter has little or no effect on the duration of gestation. (7) Constants for duration of gestation in other species have been obtained. Variability increases with the duration of oestrus and about half the variability in any species with a long oestrous period may be ascribed to this cause. (8) The factors involved in fixing the duration of gestation in the species examined are evidently the same in all cases, and probably culminate in a single agency responsible for terminating gestation. |
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Thesagro: |
Cabra; Caprino; Prenhez; Reprodução. |
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Thesaurus Nal: |
Gestation period; Goats; Pregnancy; Reproduction. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01871naa a2200217 a 4500
001 1524101
005 2023-04-28
008 1929 bl uuuu u00u1 u #d
100 1 $aASDELL, S. A.
245 $aVariation in the duration of gestation in the goat.$h[electronic resource]
260 $c1929
520 $a(1) A large series of data on the duration of gestation in the goat has been analysed and the constants calculated. (2) The frequency curve is unimodal and symmetrical, suggesting a single factor or a variety of factors acting simultaneously as the cause for birth. (3) Slight breed differences exist in the duration of gestation in the goat as in other species examined. (4) There is a continuous variation in the duration of gestation with the time of year at which conception occurs. Spring conceptions give shorter gestations than autumn conceptions. (5) There is a distinct difference in the duration of gestation for young and older dams. This is related to the age of the dams and not to the order of the births. Gestation is shorter in the young animal than in the older. (6) In the goat the size of litter has little or no effect on the duration of gestation. (7) Constants for duration of gestation in other species have been obtained. Variability increases with the duration of oestrus and about half the variability in any species with a long oestrous period may be ascribed to this cause. (8) The factors involved in fixing the duration of gestation in the species examined are evidently the same in all cases, and probably culminate in a single agency responsible for terminating gestation.
650 $aGestation period
650 $aGoats
650 $aPregnancy
650 $aReproduction
650 $aCabra
650 $aCaprino
650 $aPrenhez
650 $aReprodução
773 $tJournal Agricultural Science$gv. 19, n. 2, p. 382-386, 1929.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
