PSXII-16 High and medium ADG on LH profile in early-weaned heifers
نویسندگان
چکیده
منابع مشابه
Effect of timing of feeding a high-concentrate diet on growth and attainment of puberty in early-weaned heifers.
Precocious puberty (<300 d of age) can be successfully induced in a majority of heifers with early weaning and continuous feeding of a high-concentrate diet. The objective of this experiment was to determine the relative effects of timing of feeding a high-concentrate diet on age at puberty in early-weaned heifers. Sixty crossbred Angus and Simmental heifer calves were weaned at 112 +/- 2 d of ...
متن کاملEffects of Metabolic Imprinting on Growth and Reproductive Performance of Early-weaned Beef Heifers
This study evaluated the effects of calf management following early weaning (EW) on growth and reproductive performance of beef heifers. On d 0, Brahman x British heifers (n = 40; body weight [BW] = 187 ± 37 lb; age = 69 ± 12 d) were stratified by age and BW, and randomly assigned to be normally-weaned on d 177 (NW), or 1 of 3 EW treatments: (1) EW and grazed on ryegrass pastures for 67 d then ...
متن کاملOestrus, LH, ovulation and fertility in beef heifers.
The pregnancy rate resulting from matings at a single oestrus in beef cattle averages 70% for natural mating (Turman, Laster, Renbarger & Stephens, 1971) and 60% for artificial insemination (Laster, Glimp & Gregory, 1972). The sources and causes of low pregnancy rates have not been defined, but might include variation in time of ovulation relative to deposition of spermatozoa in the female repr...
متن کاملFertilization and blood levels of progesterone and LH in beef heifers on a restricted energy diet.
Two groups of yearling beef heifers were fed different levels of nutri t ion to study the effect of reduced energy intake on fertilization rate and blood levels of progesterone and luteinizing hormone (LH). Control heifers received a ration meeting N.R.C. recommendations for all nutrients, while heifers on the restricted diet received only one-third of the recommended energy. Ova recovery rates...
متن کاملInfluence of pre- and post-partum nutrition on LH secretion in suckled postpartum beef heifers.
The influence of nutrition during the last trimester of pregnancy and the early postpartum period on postpartum LH secretion was evaluated in two-year-old Hereford and Simmental heifers maintained on a high or low plane of nutrition (experiment 1) or in Hereford heifers fed a high or low energy (150% vs 100% NRC) ration (experiment 2). Amount of LH released with 10 mg estradiol benzoate (IM) at...
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ژورنال
عنوان ژورنال: Journal of Animal Science
سال: 2019
ISSN: 0021-8812,1525-3163
DOI: 10.1093/jas/skz258.838