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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: |
17/06/2025 |
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Autoria: |
MCCANCE, I.; ALEXANDER, G. |
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Título: |
The onset of lactation in the Merino ewe and its modification by nutritional factors. |
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Ano de publicação: |
1959 |
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Fonte/Imprenta: |
Australian Journal of Agricultural Research, v. 10, n. 5, p. 699-719, 1959. |
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DOI: |
https://doi.org/10.1071/AR9590699 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: The results of five series of observations on the type of udder content's and rate of milk secretion in the Merino ewe at about the time of parturition are presented. In general the type of secretion underwent a sequence of changes from a slowly secreted, very viscous material to the rapidly secreted "normal colostrum" and normal milk. It is suggested that the very viscous material should not be described as "colostrum" even when it appears at parturition, and that "colostrum" is a mixture of normal milk with the pre-existing mammary secretions. In ewes fed to gain weight during pregnancy the viscous material had usually been replaced by later-appearing types at parturition; copious lactation usually commenced at parturition or some hours earlier. In ewes fed to lose weight during the last 2-6 weeks of pregnancy, the changes were delayed; prior to parturition the incidence of expressible secretion was lower than in well-fed ewes; the viscous material, or no secretion at all, was often present at parturition, and copious lactation was often not apparent until up to 12 hr after parturition. The delay in onset was not associated with the shorter gestation period of the poorly fed ewes. After the onset of copious lactation, the rate of secretion by poorly fed ewes was about half that of ewes fed to gain or maintain weight during pregnancy. That the Merino is a relatively poor producer of milk even when well fed is indicated by comparison with published data for other breeds. It is concluded that the delayed onset of lactation and reduced rate of production of milk by poorly fed ewes would substantially reduce the chance of survival of lambs in early life. MenosAbstract: The results of five series of observations on the type of udder content's and rate of milk secretion in the Merino ewe at about the time of parturition are presented. In general the type of secretion underwent a sequence of changes from a slowly secreted, very viscous material to the rapidly secreted "normal colostrum" and normal milk. It is suggested that the very viscous material should not be described as "colostrum" even when it appears at parturition, and that "colostrum" is a mixture of normal milk with the pre-existing mammary secretions. In ewes fed to gain weight during pregnancy the viscous material had usually been replaced by later-appearing types at parturition; copious lactation usually commenced at parturition or some hours earlier. In ewes fed to lose weight during the last 2-6 weeks of pregnancy, the changes were delayed; prior to parturition the incidence of expressible secretion was lower than in well-fed ewes; the viscous material, or no secretion at all, was often present at parturition, and copious lactation was often not apparent until up to 12 hr after parturition. The delay in onset was not associated with the shorter gestation period of the poorly fed ewes. After the onset of copious lactation, the rate of secretion by poorly fed ewes was about half that of ewes fed to gain or maintain weight during pregnancy. That the Merino is a relatively poor producer of milk even when well fed is indicated by comparison with published data for other b... Mostrar Tudo |
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Palavras-Chave: |
Raça Merino. |
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Thesagro: |
Lactação; Nutrição; Ovino. |
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Thesaurus Nal: |
Colostrum; Ewes; Lactation; Lambs; Milk production; Milk secretion; Mortality; Parturition; Pregnancy; Sheep feeding. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02552naa a2200313 a 4500
001 1522199
005 2025-06-17
008 1959 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1071/AR9590699$2DOI
100 1 $aMCCANCE, I.
245 $aThe onset of lactation in the Merino ewe and its modification by nutritional factors.$h[electronic resource]
260 $c1959
520 $aAbstract: The results of five series of observations on the type of udder content's and rate of milk secretion in the Merino ewe at about the time of parturition are presented. In general the type of secretion underwent a sequence of changes from a slowly secreted, very viscous material to the rapidly secreted "normal colostrum" and normal milk. It is suggested that the very viscous material should not be described as "colostrum" even when it appears at parturition, and that "colostrum" is a mixture of normal milk with the pre-existing mammary secretions. In ewes fed to gain weight during pregnancy the viscous material had usually been replaced by later-appearing types at parturition; copious lactation usually commenced at parturition or some hours earlier. In ewes fed to lose weight during the last 2-6 weeks of pregnancy, the changes were delayed; prior to parturition the incidence of expressible secretion was lower than in well-fed ewes; the viscous material, or no secretion at all, was often present at parturition, and copious lactation was often not apparent until up to 12 hr after parturition. The delay in onset was not associated with the shorter gestation period of the poorly fed ewes. After the onset of copious lactation, the rate of secretion by poorly fed ewes was about half that of ewes fed to gain or maintain weight during pregnancy. That the Merino is a relatively poor producer of milk even when well fed is indicated by comparison with published data for other breeds. It is concluded that the delayed onset of lactation and reduced rate of production of milk by poorly fed ewes would substantially reduce the chance of survival of lambs in early life.
650 $aColostrum
650 $aEwes
650 $aLactation
650 $aLambs
650 $aMilk production
650 $aMilk secretion
650 $aMortality
650 $aParturition
650 $aPregnancy
650 $aSheep feeding
650 $aLactação
650 $aNutrição
650 $aOvino
653 $aRaça Merino
700 1 $aALEXANDER, G.
773 $tAustralian Journal of Agricultural Research$gv. 10, n. 5, p. 699-719, 1959.
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| 1. |  | GOMES, M. A. F.; PAULA, M. M. de; DIOGO, A.; FARIAS, C. D.; FILIZOLA, H. F.; SOUZA, M. D. de; RODRIGUEZ CARBALLAL, M. Levantamento pedológico das áreas de afloramento do Aqüífero Guarani na região das nascentes do Rio Araguaia, GO/MT. In: GOMES, M. A. F. (Ed.). Uso agrícola das áreas de afloramento do Aqüífero Guarani no Brasil: implicações para a água subterrânea e propostas de gestão com enfoque agroambiental. Brasília, DF: Embrapa Informação Tecnológica; Jaguariúna: Embrapa Meio Ambiente, 2008. p.65-86.| Tipo: Capítulo em Livro Técnico-Científico |
| Biblioteca(s): Embrapa Meio Ambiente. |
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| Registros recuperados : 3 | |
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