Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds
The relationships between testis size, hormone secretion and sperm production were studied during the spring (December) and autumn (May) in rams of two breeds with different breeding seasons and body weights (Corriedale and Australian Merino) maintained on native pastures and under natural photoperi...
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todo:paper_09265287_v39_n5-6_p617_FernandezAbella2023-10-03T15:46:37Z Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds Fernandez-Abella, D. Becu-Villalobos, D. Lacau-Mengido, I.M. Villegas, N. Bentancur, O. Gonadotropins Rams Sperm production Testicular size Testosterone follitropin gonadotropin luteinizing hormone testosterone blood sampling body weight breeding conference paper correlation function follitropin blood level gonadotropin blood level gonadotropin release luteinizing hormone blood level male nonhuman photoperiodicity pulsatile hormone release seasonal variation sheep spermatogenesis testis size testosterone blood level testosterone release Uruguay The relationships between testis size, hormone secretion and sperm production were studied during the spring (December) and autumn (May) in rams of two breeds with different breeding seasons and body weights (Corriedale and Australian Merino) maintained on native pastures and under natural photoperiods in Uruguay. Blood samples were collected at 20-min intervals during a 260-360-min period in 13 rams (four Corriedale, nine Australian Merino) during the late spring and autumn. Rams were weighed and testis size was estimated by orchimetry at each time period. Sperm production was estimated during a 2-week period, 2 months before blood collection and during each week following every blood collection. There was no relationship between testicular size and sperm production measured at the same time, nor between live weight and sperm production. In contrast, testicular volume during the late spring was correlated with sperm production in the autumn (r = 0.65; P = 0.02). The autumn serum LH was higher in Corriedale than in Merino rams. LH pulsatility was unaffected by season, but LH pulse frequency tended to be higher in Corriedale than in Merino rams, particularly in the late spring (2.37 versus 1.56 pulses/6 h; P = 0.08). Serum testosterone concentration was similar in both breeds and seasons. FSH levels were higher in the late spring than in the autumn in both breeds (Corriedale: 2.83 ± 0.48 versus 2.17 ± 0.24 ng.mL-1; Merino: 2.23 ± 0.24 versus 1.88 ± 0.17 ng.mL-1). FSH and testosterone concentrations during the late spring were positively correlated with autumn sperm production (P = 0.07 and P = 0.03, respectively). In conclusion, the present experiment suggests that LH secretion is not a good parameter for the prediction of sperm production. In contrast, in our conditions (breeds and native pastures) testicular size and testosterone or FSH concentrations from the late spring may be used to predict sperm production in the autumn. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09265287_v39_n5-6_p617_FernandezAbella |
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Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Gonadotropins Rams Sperm production Testicular size Testosterone follitropin gonadotropin luteinizing hormone testosterone blood sampling body weight breeding conference paper correlation function follitropin blood level gonadotropin blood level gonadotropin release luteinizing hormone blood level male nonhuman photoperiodicity pulsatile hormone release seasonal variation sheep spermatogenesis testis size testosterone blood level testosterone release Uruguay |
| spellingShingle |
Gonadotropins Rams Sperm production Testicular size Testosterone follitropin gonadotropin luteinizing hormone testosterone blood sampling body weight breeding conference paper correlation function follitropin blood level gonadotropin blood level gonadotropin release luteinizing hormone blood level male nonhuman photoperiodicity pulsatile hormone release seasonal variation sheep spermatogenesis testis size testosterone blood level testosterone release Uruguay Fernandez-Abella, D. Becu-Villalobos, D. Lacau-Mengido, I.M. Villegas, N. Bentancur, O. Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| topic_facet |
Gonadotropins Rams Sperm production Testicular size Testosterone follitropin gonadotropin luteinizing hormone testosterone blood sampling body weight breeding conference paper correlation function follitropin blood level gonadotropin blood level gonadotropin release luteinizing hormone blood level male nonhuman photoperiodicity pulsatile hormone release seasonal variation sheep spermatogenesis testis size testosterone blood level testosterone release Uruguay |
| description |
The relationships between testis size, hormone secretion and sperm production were studied during the spring (December) and autumn (May) in rams of two breeds with different breeding seasons and body weights (Corriedale and Australian Merino) maintained on native pastures and under natural photoperiods in Uruguay. Blood samples were collected at 20-min intervals during a 260-360-min period in 13 rams (four Corriedale, nine Australian Merino) during the late spring and autumn. Rams were weighed and testis size was estimated by orchimetry at each time period. Sperm production was estimated during a 2-week period, 2 months before blood collection and during each week following every blood collection. There was no relationship between testicular size and sperm production measured at the same time, nor between live weight and sperm production. In contrast, testicular volume during the late spring was correlated with sperm production in the autumn (r = 0.65; P = 0.02). The autumn serum LH was higher in Corriedale than in Merino rams. LH pulsatility was unaffected by season, but LH pulse frequency tended to be higher in Corriedale than in Merino rams, particularly in the late spring (2.37 versus 1.56 pulses/6 h; P = 0.08). Serum testosterone concentration was similar in both breeds and seasons. FSH levels were higher in the late spring than in the autumn in both breeds (Corriedale: 2.83 ± 0.48 versus 2.17 ± 0.24 ng.mL-1; Merino: 2.23 ± 0.24 versus 1.88 ± 0.17 ng.mL-1). FSH and testosterone concentrations during the late spring were positively correlated with autumn sperm production (P = 0.07 and P = 0.03, respectively). In conclusion, the present experiment suggests that LH secretion is not a good parameter for the prediction of sperm production. In contrast, in our conditions (breeds and native pastures) testicular size and testosterone or FSH concentrations from the late spring may be used to predict sperm production in the autumn. |
| format |
JOUR |
| author |
Fernandez-Abella, D. Becu-Villalobos, D. Lacau-Mengido, I.M. Villegas, N. Bentancur, O. |
| author_facet |
Fernandez-Abella, D. Becu-Villalobos, D. Lacau-Mengido, I.M. Villegas, N. Bentancur, O. |
| author_sort |
Fernandez-Abella, D. |
| title |
Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| title_short |
Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| title_full |
Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| title_fullStr |
Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| title_full_unstemmed |
Sperm production, testicular size, serum gonadotropins and testosterone levels in Merino and Corriedale breeds |
| title_sort |
sperm production, testicular size, serum gonadotropins and testosterone levels in merino and corriedale breeds |
| url |
http://hdl.handle.net/20.500.12110/paper_09265287_v39_n5-6_p617_FernandezAbella |
| work_keys_str_mv |
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