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- W2093146375 abstract "Abstract Groups of Romney ewes were joined with either Dorset or Romney rams on December 24 1975 and further groups joined on January 30 1976. A control group was subjected to laparotomy and joined with Romney rams after first ovulation was observed. Matings were recorded daily in all groups. At weekly intervals rams were separated from ewes and bled every 10 minutes for one hour. The plasma was radioimmunoassayed for testosterone. Ewes run with rams showed their first estrus of the breeding season earlier than controls and their onset was more synchronised. The time of ram joining did not affect the time of first estrus but ewes joined with Dorsets showed their first estrus earlier than those with Romneys. Romney rams had significantly higher mean testosterone levels than Dorsets on 5 of the 11 weekly bleedings throughout summer. The testosterone level decreased significantly over the seven consecutive bleedings of the hourly sampling period in five weeks and a significant interaction between breed of ram and testosterone level of consecutive bleedings was observed in three weeks. The results show that testosterone levels in Dorset and Romney rams during summer do not reflect the effectiveness of the breeds in inducing the early onset of estrus in Romney ewes." @default.
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- W2093146375 date "1978-03-01" @default.
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- W2093146375 title "Testosterone levels in Dorset and Romney rams and the effectiveness of these breeds in stimulating early onset of estrus in Romney ewes" @default.
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- W2093146375 doi "https://doi.org/10.1016/0093-691x(78)90035-3" @default.
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