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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: |
16/05/2023 |
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Autoria: |
ALLISON, A. J. |
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Título: |
Ewe and ram fertility in commercial flocks mated with differing numbers of ewes per ram. |
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Ano de publicação: |
1975 |
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Fonte/Imprenta: |
New Zealand Journal of Experimental Agriculture, v. 3, n. 2, p. 161-167, 1975. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Groups of four or five rams were mated with groups of ewes at two ram-to-ewe ratios on each of five commercial properties. Crayon colours indicative of mating were recorded 17, 34, and 51 days after the start of the experiments. The number of ewes pregnant was determined 120 days after the start of mating. Doubling the number of ewes per ram in comparison with traditional practices had no detrimental effects on percentages of ewes mated, returning to service, or pregnant at the time of diagnosis. As the number of ewes per ram increased the number of ewes mated by each ram also increased, and in four of five experiments the mean number of rams mating each ewe decreased (P < 0.01). In three experiments return-to-service rates were higher in ewes mated by one ram only than in ewes mated by two or more rams (P < 0.01). There was no indication that 1½-year-old rams were less active than older rams. |
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Palavras-Chave: |
Manejo reprodutivo; Mating. |
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Thesagro: |
Acasalamento; Fertilidade; Ovino; Reprodução. |
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Thesaurus Nal: |
Animal fertility; Ewes; Rams; Reproduction; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 01627naa a2200253 a 4500
001 1521388
005 2023-05-16
008 1975 bl uuuu u00u1 u #d
100 1 $aALLISON, A. J.
245 $aEwe and ram fertility in commercial flocks mated with differing numbers of ewes per ram.$h[electronic resource]
260 $c1975
520 $aAbstract: Groups of four or five rams were mated with groups of ewes at two ram-to-ewe ratios on each of five commercial properties. Crayon colours indicative of mating were recorded 17, 34, and 51 days after the start of the experiments. The number of ewes pregnant was determined 120 days after the start of mating. Doubling the number of ewes per ram in comparison with traditional practices had no detrimental effects on percentages of ewes mated, returning to service, or pregnant at the time of diagnosis. As the number of ewes per ram increased the number of ewes mated by each ram also increased, and in four of five experiments the mean number of rams mating each ewe decreased (P < 0.01). In three experiments return-to-service rates were higher in ewes mated by one ram only than in ewes mated by two or more rams (P < 0.01). There was no indication that 1½-year-old rams were less active than older rams.
650 $aAnimal fertility
650 $aEwes
650 $aRams
650 $aReproduction
650 $aSheep
650 $aAcasalamento
650 $aFertilidade
650 $aOvino
650 $aReprodução
653 $aManejo reprodutivo
653 $aMating
773 $tNew Zealand Journal of Experimental Agriculture$gv. 3, n. 2, p. 161-167, 1975.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
