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 | Acesso ao texto completo restrito à biblioteca da Embrapa Caprinos e Ovinos. Para informações adicionais entre em contato com cnpc.biblioteca@embrapa.br. |
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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: |
25/04/2023 |
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Autoria: |
SCHOEMAN, S. J.; HELEEN, C. E.; COMBRINK, G. C. |
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Título: |
A preliminary investigation into the use of testis size in cross-bred rams as a selection index for ovulation rate in female relatives. |
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Ano de publicação: |
1987 |
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Fonte/Imprenta: |
South African Journal Science, v. 17, n. 3, p. 144-147, 1987. |
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Idioma: |
Inglês |
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Conteúdo: |
Twenty one pairs of twins, all progeny of one sire, of which one was a male and the other a female, were weighed monthly from 3 to l4 months of age. Scrotal circumference (SC) and testes volume (TV) in rams were measured simultaneously. A vasectomized ram was used tcr detect oestrous in ewes at 18 months of age. Laparotomy was used to determine the ovulation rate. Statistically significant (P<0,05) phenotypic correlations are only indicated between the ages of 5 and 6 months. Correlations between these ages varied from 0,371 to 0,481. At 5 months of age all these coefficients are statistically significant (r : 0.428 to 0,466; P<0,05), which coincided with the attainment of puberty. When testis size measurements were adjusted for differences in body mass, all correlation coefficients becetme statistically nonsignificant (r : 0,133 to 0,348; P>0,05). Partialcorrelation coefficients between testis size and ovulation rate when body mass in both rams and ewes were fixed, varied from 4 to 7 months of age in the ram from 0,203 to 0,616. These correlations were statistically significant for TV at 6 months (P<0,05) and for SC at 7 months (P<0,01). Although prepubertal testis size would be of more practical value in selection for ovulation rate, testis size at puberty may be more valuable as an indication of ovulation rate in female relatives |
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Palavras-Chave: |
Andrologia; Ovulation rate; Sistema genital; Testis size. |
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Thesagro: |
Ovino; Reprodução; Testículo. |
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Thesaurus Nal: |
Rams; Reproduction; Reproductive performance; Sheep; Twins. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02202naa a2200289 a 4500
001 1521015
005 2023-04-25
008 1987 bl uuuu u00u1 u #d
100 1 $aSCHOEMAN, S. J.
245 $aA preliminary investigation into the use of testis size in cross-bred rams as a selection index for ovulation rate in female relatives.$h[electronic resource]
260 $c1987
520 $aTwenty one pairs of twins, all progeny of one sire, of which one was a male and the other a female, were weighed monthly from 3 to l4 months of age. Scrotal circumference (SC) and testes volume (TV) in rams were measured simultaneously. A vasectomized ram was used tcr detect oestrous in ewes at 18 months of age. Laparotomy was used to determine the ovulation rate. Statistically significant (P<0,05) phenotypic correlations are only indicated between the ages of 5 and 6 months. Correlations between these ages varied from 0,371 to 0,481. At 5 months of age all these coefficients are statistically significant (r : 0.428 to 0,466; P<0,05), which coincided with the attainment of puberty. When testis size measurements were adjusted for differences in body mass, all correlation coefficients becetme statistically nonsignificant (r : 0,133 to 0,348; P>0,05). Partialcorrelation coefficients between testis size and ovulation rate when body mass in both rams and ewes were fixed, varied from 4 to 7 months of age in the ram from 0,203 to 0,616. These correlations were statistically significant for TV at 6 months (P<0,05) and for SC at 7 months (P<0,01). Although prepubertal testis size would be of more practical value in selection for ovulation rate, testis size at puberty may be more valuable as an indication of ovulation rate in female relatives
650 $aRams
650 $aReproduction
650 $aReproductive performance
650 $aSheep
650 $aTwins
650 $aOvino
650 $aReprodução
650 $aTestículo
653 $aAndrologia
653 $aOvulation rate
653 $aSistema genital
653 $aTestis size
700 1 $aHELEEN, C. E.
700 1 $aCOMBRINK, G. C.
773 $tSouth African Journal Science$gv. 17, n. 3, p. 144-147, 1987.
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