REPRODUCTIVE PERFORMANCE OF EARLY POSTPARTUM CROSSBRED COWS SUPLLEMENTED WITH BYPASS FAT AND SUBJECTED TO HORMONAL INDUCTION OF OESTRUS
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Date
2018-11-30
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES MANNUTHY, THRISSUR
Abstract
Postpartum infertility due to negative energy balance is a major problem among
the high producing cows of Kerala, incurring huge economic loss. The present
study was aimed to evaluate the effect of supplementation of bypass fat on the
reproduction and production parameters of high yielding crossbred cows with or
without postpartum hormonal induction of oestrus and its techno-economics. The
trial was conducted with four experimental groups of six cows each (GI – control,
GII- 200 g bypass fat 90 days, GIII – 200g bypass fat daily + Ovsynch protocol
on day 45postpartum, GIV – Ovsynch protocol alone). The animals in GII and
GIII were observed to be superior in milk production parameters viz. peak yield
(P<0.05), and days taken for attaining peak yield. Cessation of post-patum lochial
discharge and its characteristics were normal in all groups. The animals in GII
and GIII showed earlier post-partum oestrus compared to others (P<0.05). As per
rectal examination and ultrasonographic findings, more number of animals in GII
and GIII showed early resumption of ovarian cyclicity. The number of days taken
for complete involution of uterus and reduction of uterine wall thickness as per
ultrasonographic examination were significantly lower in those animals fed with
bypass fat. With respect to various serum biochemical parameters, blood glucose
and total cholesterol were significantly higher (P<0.01) in those animals fed with
bypass fat. Blood urea nitrogen, non-esterified fatty acids and triglycerides were
significantly lower (P<0.01) in bypass fat fed groups. (GII and GIII). The mean
circulating blood progesterone level and serum insulin concentration were also
significantly higher (P<0.05) in the animals fed with bypass fat. The conception
rate was highest in GIII followed by GII. The study indicated that it is ideal to
supplement bypass fat before attempting hormonal induction of oestrus in early
postpartum cows for enhanced reproductive efficiency. The techno-economic
analysis of study showed that bypass fat supplementation is a financially viable,
eco-friendly and socially acceptable method for improving the production and
reproduction parameters of the cows, thereby augmenting the farm income.
Description
Submitted in partial fulfillment of the requirement for the degree of
Doctor of Philosophy in
ANIMAL REPRODUCTION, GYNAECOLOGY AND OBSTETRICS