Keywords : hCG
Effect of lecirelin acetate, hCG or progesterone administration on day 7 post-insemination on conception rate and progesterone concentration in cross-bred cattle
Iraqi Journal of Veterinary Sciences,
2018, Volume 32, Issue 2, Pages 149-153
The present study was designed to evaluate the effect of administration of lecirelin acetate, hCG and progesterone after AI on ovarian picture, serum progesterone concentrations and first service conception rate in cross-bred cattle. A total of 160 lactating cross bred (Friesian x Sahiwal) cattle were divided into 4 groups after AI. The groups were treated as follows: control (injected i.m with normal saline 2ml, n=40), d 7-LA (injected i.m with lecirelin acetate100 µg, n=40), d 7-hCG (injected with hCG 3300 IU, n=40) and d 7-P4 (injected i.m with Progesterone 0.5 mgdaily for 4 days, n=40) group. The hormonal treatments were given to animals on day 7 after AI. The ultrasonography and blood sampling was done before treatment and then 7 days later. All animals were examined for pregnancy through ultrasonography at 40 ± 1 day after AI. The diameter of SCL on 7 days after treatment was higher (P < 0.01) in group d 7-LA and d 7-hCG group cows as compared to control cows. In contrast, the diameter of SCL in d 7- P4 treated cows did not differ from control cows. Formation of ACL was observed only in 50 % & 80 % cows in d 7-LA and d 7-hCG group respectively. No ACL was observed in control and d 7- P4 cattle on day 7 after treatment. The P4 concentrations were significantly higher (P < 0.01) in d 7-hCG treated cattle as compared to control at 7 days after treatment. As compared to 10 percent First Service Conception Rate (FSCR) in controls, an increase (P < 0.05) of 50 percent and 40 percent was observed in each treatment group (d 7-hCG & d 7-LA), non-significant (P > 0.05) difference in FSCR was observed between control and d 7-P4 group. It was concluded that the use of hCG or LA, 7 days after AI is a beneficial tool to improve conception rate in cross-bred cattle whereas use of parental P4 post-breeding has no effect on SCL diameter and conception rate.
Reproductive performance improvement in primiparous lactating Holstein cows by different hormonal treatments
Iraqi Journal of Veterinary Sciences,
2012, Volume 26, Issue 2, Pages 85-87
This study was aimed to evaluate different hormonal treatments during early postpartum period on reproductive efficiency on 42 primiparous Holstein cows in the experimental farm of college of Agriculture, University of Baghdad, aged 3-3.2 y. during the period from 2010-2012. These cows were divided randomly into four groups according to hormonal treatment at day 50 postpartum. The 1st group included 11 cows and was injected with GnRH 0.0126mg/IM, the 2nd group (10 cows) injected with eCG 1000 IU/IM, the 3rd group (11 cows) administrated by hCG 1500 IU/IM and the 4th group (10 cows) without treatment as a control group. The results of this study revealed that the responsive cows (estrus behaviors) were 10 (90.9%), 8 (80%), 9 (81.8%) and 9 (90%) in the 1st, 2nd, 3rd and 4th group respectively and these results were recorded superior significant (P<0.01) for group 2 compared with group 1 and 3 related with duration from initiation of estrus, but no significant differences (P<0.01) between all groups about services per conception and number of conceived animal while the days open and calving interval was recorded significant differences (P<0.01) between the 1st, 2nd and 3rd groups compared with control group (4th group). It could be concluded that using hormonal treatment which indicated to produce improvement in certain parameters of reproductive performance provided early post partum breeding.