STUDIES ON HORMONAL THERAPIES FOR INDUCTION OF POSTPARTUM OESTRUS IN MURRAH BUFFALOES
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Date
2008-06
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT :
Studies on hormonal therapies for induction of postpartum oestrus in Murrah buffaloes were undertaken at Dairy Experimental Station College of Veterinary Science Rajendranagar and Dairy farms in Hyderabad. A total of 6068 buffaloes were studied to investigate the reproductive disorders and the incidence of smooth ovaries, postservice anestrus, postpartum anestrus, silent ovulation, anovulatory heat, luteal persistency, luteal cysts, follicular cysts and repeat breeder were found to be 17.46, 8.99, 18.45, 5.07, 3.65,
1.76, 2.34, 2.22 and 7.46 per cent, respectively. The incidence of postpartum anestrum among buffaloes was observed to be 18.45 per cent as data available at Hyderabad (East) division, Raga Reddy district during the period from 2002-03 to 2006-07.
Twenty four normally calved Murrah buffaloes of different treatment groups were examined for the time taken for complete involution of uterus. The days required for complete involution of uterus was 21, 23 and 24 days treated with PGF-2α, Methergin, and control groups, respectively. The mean values of serum calcium and serum phosphorus before treatment in postpartum anestrus Murrah buffaloes during summer and winter were 8.63 ± 0.15 mg %, 8.79 ± 0.18 mg % and 4.23 ± 0.21, 3.99 ± 0.24 mg %, respectively. The corresponding values were significantly (p<0.01) improved after treatment. A total of 60 postpartum anestrus Murrah buffaloes were treated with various treatment protocols during summer (30 buffaloes) and winter (30 buffaloes) seasons. The estrus response was observed to be higher in winter (90%, 80% and 50%) than summer season (80%, 70% and 30%) in GnRH-PGF2α-GnRH, PMSG + hCG and control groups, respectively. The days taken for induction of estrus was found to be highly significant (p<0.01) during winter months in GnRH-PGF2α-GnRH (85.44± 7.56 days) group in PMSG + hCG (89.13 ± 7.7 days) group and in control151.20±13.49 days) groups, respectively. The occurrence of estrus was observed highest percentage in day time (60, 70) than night time (20, 20) in two groups in summer and winter seasons. The intensity of estrus was observed to be more in PMSG + hCG group as 57.14, 14.28, 28.57 and 62.50, 25.00, 12.50 per cent of intense, normal and weak estrus in summer and winter season respectively, when compared to GnRH-PGF2α-GnRH as 50.00, 37.50, 12.50 and 55.55, 33.33, 11.11 per cent of intense, normal and weak estrus in summer and winter season respectively. The duration of estrus in GnRH-PGF2α-GnRH (22.5±0.5, 24.3±0.3 hours) group was longer than in PMSG + hCG (18.0±0.5, 21.0±0.5 hours) group and in control (15.33±0.8, 16.0±0.75 hours) group in summer and winter season respectively. The interval between treatment and onset of estrus was observed to be shorter days in PMSG + hCG (3.29 ± 0.52 days, 4.00 ± 0.46 days) group than in GnRH-PGF2α-GnRH (4.12 ± 0.39 days, 4.78 ± 0.43 days) group and in control (76.00 ± 1.73 days, 51.00 ± 1.68 days) group in summer and winter season respectively. The service period was observed to be significantly shorter days during winter (86.22± 8.25 days, 89.13 ± 8.75 days and 153.20±13.49 days) in GnRH-PGF2α-GnRH, PMSG + hCG and control groups, respectively when compared to during winter (110.62 ± 8.75 days, 110.00 ± 9.36 days and 195.00±12.07 days) in GnRH-PGF2α-GnRH, PMSG + hCG and control groups, respectively. The over all conception rate was observed to be higher in GnRH-PGF2α-GnRH group (70.1 %) than in PMSG + hCG group (66.1 %) and control group (36.7 %) respectively. The number of services required per conception during summer was found to be 1.75 ± 0.16, 2.00 ± 0.53 and 2.33 ± 0.88 and during winter as 1.89 ± 0.20, 2.00 ± 0.19 and, 1.80 ± 0.20 in GnRH-PGF2α-GnRH, PMSG + hCG and control groups, respectively.
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