6-Title: Effect of progesterone impregnated intravaginal sponges, pmsg and estradiol valerate on oestrus induction, fertility and progesterone profile in Sahiwal heifers
Authors: Brijesh Kumar Singh, Atul Saxena, Brijesh Kumar, KS Gunaranjan and S Mishra
Source: Ruminant Science (2012)-1(2):125-126.
How to cite this manuscript: Singh Brijesh Kumar, Saxena Atul, Kumar Brijesh, Gunaranjan KS and Mishra S (2012). Effect of progesterone impregnated intravaginal sponges, pmsg and estradiol valerate on oestrus induction, fertility and progesterone profile in Sahiwal heifers. Ruminant Science 1(2):125-126.
Sixteen Sahiwal heifers were implanted with a progesterone impregnated sponge in the anterior vagina for seven days. On day 7 sponges were removed and 500 I.U. PMSG was injected intramuscularly, while on day 8, 1mg of estradiol valerate was injected intramuscularly. Jugular veinous blood samples were collected on day 0, 7, and 8 of implant for assay of plasma progesterone. The percentage of animals that showed overt signs of estrus following withdrawal of sponges were 62.5% (10/16) and 25% (4/16) were found pregnant. Heifers which became pregnant (n=4) had a mean concentration of hormone progesterone on the day of start of treatment (day 0) as 5.88±1.91 ng/ml. The respective concentration on day 7 and day 9 were found as 1.78±0.24 and 1.52±0.71 ng/ml. Heifers which were found to be non-pregnant (n=12) had a mean concentration of hormone progesterone as 3.88±0.75 ng/ml on the day of start of treatment (day 0). The respective concentrations on day 7 and day 9 were found as 1.33±0.20, and 0.85±0.18 ng/ml, respectively.
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