Effect of peripartum nutritional supplementation on postpartum fertility and blood biochemical and steroid hormone profile in crossbred cows

摘要

Advanced pregnant healthy HF crossbred cows (n=20) of 2-4 parity were equally divided in to control (routine farm feeding-RFF) and treatment/nutrients supplementation (RFF + bypass fat @ 100-200 g/h/d and ASMM @ 50 g/h/d) groups and were studied from 2 wks prepartum to 8 wks postpartum for plasma profile of steroid hormones and metabolites on days -14, -3, 0, + 3, + 14, + 28 and + 42 as well as for puerperal events and postpartum fertility. The mean plasma progesterone values were maximum ( 6 ng/ml) on day 14 prepartum, which declined significantly (p0.01) on day 3 prepartum reached to the basal levels (1 ng/ml) on the day of calving, remained basal till day 14, and thereafter showed a rising trend on days 28 and 42 postpartum. The oestradiol-17. values were at its peak on the day of calving (p0.01), showed a rapid fall by day 3 postpartum and remained low till recrudesce of follicular activity around day 35 postpartum. However, there were no statistical differences between the two groups in either of the hormones, except on day 42 postpartum. The levels of cortisol and PGF 2. Metabolites (PGFM) were 3-8 times higher on the day of parturition as compared to values at day 14 pre-and postpartum, and declined further till day 42 postpartum reaching to prepartum levels. The plasma cholesterol gradually decreased as parturition approached and increased in postpartum days to reach the highest value (p0.01) at day 42. The nutrients supplemented cows had significantly (p0.01) higher plasma cortisol, PGFM and cholesterol values than the control cows around parturition. However, no such variation was noted in plasma protein profile. The period of uterine involution in control and supplemented groups was identical (31.97 +/- 1.82 and 30.27 +/- 1.41 days), yet the cows in treatment group resumed estrous cycle earlier (38.00 +/- 1.95 vs 42.32 +/- 4.14 days, p0.05) and had shorter service period (85.22 +/- 7.17 vs 100.67 +/- 5.60 days) with improved pregnancy rate (80 vs 60 %) as compared to those in control group. Thus, the peripartum nutrient supplementation in crossbred cows was beneficial and had positive effect on the postpartum fertility and plasma cortisol, PGFM and cholesterol profile.