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Effect of different energy levels in food on production and reproductive capacity of gilts and sows. 5. Effect on oestrus manifestation, and development and survival of embryos to 21 and 40 days of gestation



Effect of different energy levels in food on production and reproductive capacity of gilts and sows. 5. Effect on oestrus manifestation, and development and survival of embryos to 21 and 40 days of gestation



Zbornik Radova, Institut za Stocarstvo, Novi Sad (5): 107-127



In 3 groups totalling 183 Large White gilts, allocated rations in the proportions of 100 : 80 : 60% as they reached 160 days of age, length of oestrous cycle averaged 22.3, 20.6 and 22.1 days resp.; number of corpora lutea (in 9 females slaughtered/group) averaged 16.2, 13.6 and 14.6 at 21 days of gestation, and 14.4, 15.6 and 15.3 at 40 days. Embryonic mortality averaged 22.5, 16.0 and 17.1% to 21 days, and 20.6, 22.9 and 23.1% to 40 days.

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