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Original Research
1.
Estrus induction and fertility response in delayed
pubertal Kankrej heifers treated with norgestomet
ear implant -
C. F. Chaudhari, B. N. Suthar, V. K. Sharma , V.
S. Dabas , N. F. Chaudhari , H. H. Panchasara
Vet World. 2012; 5(8): 453-458
doi:
10.5455/vetworld.2012.
453-458
Abstract
Aim:
The study was undertaken to find out the estrus
induction and fertility response in delayed pubertal
Kankrej heifers treated with norgestomet ear
implant.
Materials and Methods: Total
eighteen anoestrus Kankrej heifers of delayed
puberty weighed above 250 kg and attained between 30
to 36 months of age were selected and divided in to
three groups of six animals each at random to
conduct the experiment. Animals in group 1 were
implanted Crestar ear implant for 9 days. In
addition to this, group 2 received 500 IU of PMSG on
the day of implant removal. In group 3, treatment
protocol remained same as in group 2, but Inj.
Receptal @ 2 ml was given additionally at the time
of breeding. Results: All the animals
exhibited estrus with average duration of 25.41+
0.94, 21.95+ 0.20 and 22.68 + 1.46 hours between
implant withdrawal and estrus induction in group 1,
2 and 3, respectively. The duration of estrus was
significantly (P<0.05) longer (25.61+ 2.95 hours) in
group 2, followed by group 1 (18.88 + 1.45 hours)
and group 3 (13.48 + 1.92 hours). The pregnancy rate
at induced estrus was 33.33 percent in group 2. In
group 1 and group 3 none of the heifers found
pregnant at induced estrus. The overall conception
rate was maximum in group 2 (66.67 percent) followed
by group 3 (50 percent) and group 1 (33.33 percent)
after the 3rd service.
Conclusion: Although
the conception rate at induced estrus was lower,
norgestomet ear implant could be utilized to induced
estrus in delayed pubertal cow heifers.
Keywords:
Conception rate, Delayed puberty, Estrus
induction, Heifers, Norgestomet
