Influence of diet composition, dry-matter intake, milk production and energy balance on time of post-partum ovulation and fertility in dairy cows
作者： M. C. Lucy , C. R. Staples , W. W. Thatcher , P. S. Erickson , R. M. Cleale
DOI: 10.1017/S0003356100020778
关键词: Pregnancy rate 、 Ice calving 、 Fertility 、 Biology 、 Lactation 、 Pregnancy 、 Niacin 、 Dry matter 、 Animal science 、 Ovulation
摘要: Lactating Holstein-Friesian cows from two calving groups (no. = 90) were studied during the early post-partum period to determine effect of dry-matter intake (DM1), 40 g/kg fat-corrected milk (FCM) production, energy balance (EB), parity, and food additives (calcium salts long-chain fatty acids [CaLCFA] niacin) on recrudescence ovarian function establishment pregnancy. Cows that ovulated (15 21 days after calving) consumed more tended produce FCM compared with ovulating later (22 42 or days). Primiparous had lower EB have longer intervals first ovulation multiparous but average interval pregnancy was similar for primiparous cows. Feeding CaLCFA extend service decreased rate. Production characteristics (including DMI production) seem as well (days open). Fertility affected negatively by feeding CaLCFA.
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