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The efficiency of PMSG and HCG hormones was tested in sows which did not exhibit oestrus during the week following the drying off. Three groups were treated (I’MSG, PMSG mixed with HCG, PMSG followed by HCG 72 hours later) and compared with a control group. Low doses of PMSG (400 LU.) and of HCG (200 LU.) were injected on day 9 U= 2) after weaning. Grouping of heats between day 2 and 7 after the treatment (T 2-7) varied between 50 (PMSG) and 68 per cent (PMSG and HCG after 72 hours) while, during the same period. only 35 .7 per cent of the control sows exhibited heats and were mated. As compared with the controls, the l>est grouping of farrowings was obtained in the females treated with 1’VIS(U + /and HCG. These farrowings were delayed by 2 to days in comparison with those of the females mated within

Reduction of lactation length in the sow. Consequences on reproduction, weight variations and annual productivity