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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
22/05/2023 |
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Autoria: |
KAMMLADE JUNIOR, W. C.; WELCH, J. A.; NALBANDOV, A. V.; NORTON, H. W. |
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Título: |
Pituitary activity of sheep in relation to the breeding season. |
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Ano de publicação: |
1952 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 11, n. 4, p. 646-655, Nov. 1952. |
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DOI: |
https://doi.org/10.2527/jas1952.114646x |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Recently considerable interest has been shown in the possibility of increasing the prolificacy of sheep. A variety of means has been employed experimentally to cause sheep to breed out of season. Cole and Miller (1933) were the first to demonstrate that anestrus ewes may be caused to conceive by appropriate hormone treatments. These and subsequent investigators have found this technique somewhat inefficient since, in spite of a high proportion of ewes ovulating, the resulting lamb crop is low. Hart (1950) subjected ewes to a regularly maintained rhythm of light and dark and was able to cause ?out of season? breeding. Yeates (1949) found that in Suffolks the breeding season started some ten to 14 weeks after the longest day, and similar results were obtained by Hafez (1951). The seasonal breeding behavior of sheep can also be modified by genetic means (Hafez, 1951), and the possibility of prolonging the breeding season by genetic selection is now being investigated in this and other laboratories. |
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Palavras-Chave: |
FSH. |
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Thesagro: |
Endocrinologia; Fisiologia; Ovino; Reprodução. |
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Thesaurus Nal: |
Endocrinology; Follicle-stimulating hormone; Gonadotropins; Pituitary hormones; Reproduction; Sheep. |
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Categoria do assunto: |
G Melhoramento Genético |
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Marc: |
LEADER 01874naa a2200301 a 4500
001 1522913
005 2023-05-22
008 1952 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.2527/jas1952.114646x$2DOI
100 1 $aKAMMLADE JUNIOR, W. C.
245 $aPituitary activity of sheep in relation to the breeding season.$h[electronic resource]
260 $c1952
520 $aAbstract: Recently considerable interest has been shown in the possibility of increasing the prolificacy of sheep. A variety of means has been employed experimentally to cause sheep to breed out of season. Cole and Miller (1933) were the first to demonstrate that anestrus ewes may be caused to conceive by appropriate hormone treatments. These and subsequent investigators have found this technique somewhat inefficient since, in spite of a high proportion of ewes ovulating, the resulting lamb crop is low. Hart (1950) subjected ewes to a regularly maintained rhythm of light and dark and was able to cause ?out of season? breeding. Yeates (1949) found that in Suffolks the breeding season started some ten to 14 weeks after the longest day, and similar results were obtained by Hafez (1951). The seasonal breeding behavior of sheep can also be modified by genetic means (Hafez, 1951), and the possibility of prolonging the breeding season by genetic selection is now being investigated in this and other laboratories.
650 $aEndocrinology
650 $aFollicle-stimulating hormone
650 $aGonadotropins
650 $aPituitary hormones
650 $aReproduction
650 $aSheep
650 $aEndocrinologia
650 $aFisiologia
650 $aOvino
650 $aReprodução
653 $aFSH
700 1 $aWELCH, J. A.
700 1 $aNALBANDOV, A. V.
700 1 $aNORTON, H. W.
773 $tJournal of Animal Science$gv. 11, n. 4, p. 646-655, Nov. 1952.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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