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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: |
21/06/2023 |
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Autoria: |
SCHANBACHER, B. D. |
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Título: |
Fertility of rams chronically treated with gonadotropin releasing hormone during the nonbreeding season. |
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Ano de publicação: |
1978 |
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Fonte/Imprenta: |
Biology Reproduction, v. 19, n. 3, p. 661-665, 1978. |
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DOI: |
https://doi.org/10.1095/biolreprod19.3.661 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: Mature crossbred rams were injected chronically with gonadotropin releasing hormone (GNRH) during the nonbreeding season to determine whether endogenous gonadotropins could stimulate certain aspects of reproductive function, including fertility. Twice daily, 50 ?g injections of GNRH resulted in testicular growth which was accompanied by increased serum concentrations of testosterone. Although the results of this study were confounded by seasonal changes in testicular function, daily sperm production remained higher (P<0.05) in GNRH-treated rams (18.9 × 109 sperm) than in rams treated with saline (15.0 × 109 sperm). Semen samples collected from GNRH-treated rams after 2 months of treatment varied considerably with respect to volume and sperm concentration, however, an increase (P<0.0l) in the percentage of live sperm with progressive motility suggests that those sperm being produced were of higher quality. Increased libido was suggested for GNRH-treated rams, however, when these rams were penned with 23 or 24 estrus synchronized ewes, the percentage of ewes mated was similar for saline-(92%) and GNRH-treated (93%) rams. Also, the percentage of ewes lambing (62% for saline-treated rams vs 60% for GNRH-treated rams) and the number of lambs per ewe lambing (2.1 for saline-treated rams vs 2.0 for GNRH-treated rams) did not differ. While it is possible that GNRH has no beneficial effect on fertility of rams during the nonbreeding season, it could be that differences in fertility of rams were simply not detectable under the conditions of this study. MenosAbstract: Mature crossbred rams were injected chronically with gonadotropin releasing hormone (GNRH) during the nonbreeding season to determine whether endogenous gonadotropins could stimulate certain aspects of reproductive function, including fertility. Twice daily, 50 ?g injections of GNRH resulted in testicular growth which was accompanied by increased serum concentrations of testosterone. Although the results of this study were confounded by seasonal changes in testicular function, daily sperm production remained higher (P<0.05) in GNRH-treated rams (18.9 × 109 sperm) than in rams treated with saline (15.0 × 109 sperm). Semen samples collected from GNRH-treated rams after 2 months of treatment varied considerably with respect to volume and sperm concentration, however, an increase (P<0.0l) in the percentage of live sperm with progressive motility suggests that those sperm being produced were of higher quality. Increased libido was suggested for GNRH-treated rams, however, when these rams were penned with 23 or 24 estrus synchronized ewes, the percentage of ewes mated was similar for saline-(92%) and GNRH-treated (93%) rams. Also, the percentage of ewes lambing (62% for saline-treated rams vs 60% for GNRH-treated rams) and the number of lambs per ewe lambing (2.1 for saline-treated rams vs 2.0 for GNRH-treated rams) did not differ. While it is possible that GNRH has no beneficial effect on fertility of rams during the nonbreeding season, it could be that differences in f... Mostrar Tudo |
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Palavras-Chave: |
Drug effects; Testis. |
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Thesagro: |
Endocrinologia; Fisiologia; Ovino; Reprodução. |
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Thesaurus Nal: |
Endocrinology; Epididymis; Pharmacology; Pituitary hormone-releasing hormones; Reproduction; Seasons; Sexual behavior; Sheep; Spermatogenesis; Spermatozoa; Testosterone. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02552naa a2200337 a 4500
001 1521531
005 2023-06-21
008 1978 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1095/biolreprod19.3.661$2DOI
100 1 $aSCHANBACHER, B. D.
245 $aFertility of rams chronically treated with gonadotropin releasing hormone during the nonbreeding season.$h[electronic resource]
260 $c1978
520 $aAbstract: Mature crossbred rams were injected chronically with gonadotropin releasing hormone (GNRH) during the nonbreeding season to determine whether endogenous gonadotropins could stimulate certain aspects of reproductive function, including fertility. Twice daily, 50 ?g injections of GNRH resulted in testicular growth which was accompanied by increased serum concentrations of testosterone. Although the results of this study were confounded by seasonal changes in testicular function, daily sperm production remained higher (P<0.05) in GNRH-treated rams (18.9 × 109 sperm) than in rams treated with saline (15.0 × 109 sperm). Semen samples collected from GNRH-treated rams after 2 months of treatment varied considerably with respect to volume and sperm concentration, however, an increase (P<0.0l) in the percentage of live sperm with progressive motility suggests that those sperm being produced were of higher quality. Increased libido was suggested for GNRH-treated rams, however, when these rams were penned with 23 or 24 estrus synchronized ewes, the percentage of ewes mated was similar for saline-(92%) and GNRH-treated (93%) rams. Also, the percentage of ewes lambing (62% for saline-treated rams vs 60% for GNRH-treated rams) and the number of lambs per ewe lambing (2.1 for saline-treated rams vs 2.0 for GNRH-treated rams) did not differ. While it is possible that GNRH has no beneficial effect on fertility of rams during the nonbreeding season, it could be that differences in fertility of rams were simply not detectable under the conditions of this study.
650 $aEndocrinology
650 $aEpididymis
650 $aPharmacology
650 $aPituitary hormone-releasing hormones
650 $aReproduction
650 $aSeasons
650 $aSexual behavior
650 $aSheep
650 $aSpermatogenesis
650 $aSpermatozoa
650 $aTestosterone
650 $aEndocrinologia
650 $aFisiologia
650 $aOvino
650 $aReprodução
653 $aDrug effects
653 $aTestis
773 $tBiology Reproduction$gv. 19, n. 3, p. 661-665, 1978.
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