Conception Rates of Holstein-Friesian Cows Inseminated Artificially with Reducing Frozen Semen Doses
Abstract: Conception rates of
Holstein Friesian (HF) acceptors were evaluated in artificial insemination (AI)
mating using three frozen semen doses of the straws per volume of 0.25 cc. Frozen semen consisted of a standard dose by
25 x 106 sperms (L.1) and two reduced doses by 20 x 106 sperms (L.2) and 15x106
sperms (L.3). This field study was
conducted in dairy cattle area of Lembang NBMCU, from August 2011 to March
2012. Frozen semens were obtained from
two HF national progeny tested young bulls. Conception was detected by rectal
palpation, around 60-90 days after AI mating. Conception rates (CR %) were
calculated as a ratio between pregnant acceptors to the total AI mated
cows. Some general linear model analyzes
were conducted by considering fixed variables of semen dose (3), bull (2),
inseminator (6) and parity (5). The
results showed that three frozen semen doses did not significantly affect
(P>0.05) on CR (%). By decreasing
semen dose to L.3 gave CR (%) similar to L2 even to L1. It was concluded that frozen semen doses of
HF bulls at the levels of 20 million to 15 million sperms per straw per volume
of 0.25 cc resulted CR (%) similar to the standard one.
Author: Anneke Anggraeni, T.
Herawati, L. Praharani, D. Utami, A. Argis
Journal Code: jppeternakangg160034
