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Control at will of the sexual cycle in ewes. VIII. An experiment in the use of pregnant mare's serum to induce more frequent lambings at the state farm Kuban



Control at will of the sexual cycle in ewes. VIII. An experiment in the use of pregnant mare's serum to induce more frequent lambings at the state farm Kuban



Trud. Dinam. Razvit 11: 80-93



DURING July-Aug. 1936, 169 ewes were injected once with 100-500 M.U. PMS; 54 (39.9%) came on heat v. 8.5% in untreated controls; 23 were mated and 10 (43.5%) lambed. The 115 remaining animals showed no signs of heat, and after forced insemination only 22 (19.1%) lambed. Of 262 ewes injected twice, 149 came on heat after the 1st injection, and 28 (24.7%) of the remaining. 113 after the 2nd injection 16 days later. The lambing % in the 2 groups was 43.5 and 33.3 resp.

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