AUGMENTATION OF FERTILITY IN REPEAT BREEDER CROSS BRED COWS
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Date
2005-10
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT :
The studies on “Augmentation of fertility in repeat breeder cross bred cows” were carried out at Department of Animal Reproduction and Gynaecology, college of veterinary science, Tirupati by utilising 60 repeat breeders cross bred cows and 30 normal breeders cross bred cows. The repeat breeder cross bred cows were subjected to various treatments such as GnRH, hCG, Placentrex, Double insemination on day 0 and compared the efficacy of the treatment groups with the control group.
The incidence of repeat breeding was 36.93 per cent among infertility cases examined during the present study. Where as the incidence of repeat breeding was 4.38 per cent in cross bred cows. It was analysed as per the data of Animal Husbandry Department, Chittoor for the years of 1998-99 to 2004-05. The incidence of short, normal and long estrous cycles was 16.66, 56.67 and 26.67 per cent in normal breeders and 20, 51.67 and 28.33 per cent in repeat breeders respectively. The duration of estrus in repeat breeder cows (73.33per cent) was higher than the normal breeders (50per cent).
In the present investigation, the cervical discharge of repeat breeder was thick in consistency (65 per cent) than in normal breeder cows (10per cent). The fern pattern of cervical mucus was mostly atypical (60 per cent) in repeat breeder cows when compared to normal breeders cows (20 per cent). The average pH of the cervical mucus of repeat breeder cows (7.68±0.15) was significantly higher than in normal breeder cows (6.95±0.14). Spinnbarkeit (SBK) values of cervical mucus of repeat breeder cows (8.33±0.32 cm) were significantly lower than in normal breeder cows (15.86 ± 0.66 cm). The mean values of haemoglobin, serum calcium, serum phosphorus, alkalinephosphatase activity and acidphosphatase activity were found to be 10.84±0.31gm%/dl, 10.65±0.29mg/dl, 4.74± 0.15mg/dl, 6.02±0.35KAU and 1.87±0.13KAU in normal breeders respectively and 9.55±0.25 gm%/dl, 10.92±0.26 mg/dl, 3.75±0.08 mg/dl, 11.38±0.49 KAU and 2.33±0.24 KAU in repeat breeders respectively. The haemoglobin and the serum inorganic phosphorus levels in repeat breeders were significantly lower than the normal breeders. The serum alkalinephosphatase and acidphosphatase activity were significantly higher in repeat breeders than the normal breeders. However no significant change was noticed in serum calcium levels in both repeat breeders and normal breeders.
The conception rates in repeat breeding cross bred cows to first insemination, second insemination and overall were observed to be 50.00, 16.67 and 58.33 percent in GnRH treated group; 58.33, 20.00 and 66.66 percent in hCG treated group; 41.67, 28.57 and 58.33 percent in Placentrex treated group; 33.33, 12.50 and 41.66 percent in Double insemination group and 8.33, 9.10 and 16.67 percent for control groups respectively. Higher conception rate was observed in hCG treated repeat breeder cows. To conclude in the present study, the enhanced conception rates were observed in all the three hormones treated and double inseminated cross bred cows when compared to control.
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