STUDIES ON CERTAIN HORMONAL AND NUTRITIONAL STRATEGIES TO IMPROVE SYNCHRONIZATION OF ESTRUS AND FERTILTIY IN EWES UNDER FARM CONDITIONS DURING NON BREEDING SEASON
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Date
2021-07
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
The present study was undertaken to determine the efficacy of hormonal and nutritional strategies in postpartum anestrous Vizianagaram ewes during the non-breeding season. A total of 48 healthy postpartum anestrous ewes aged about 2 to 4 years were selected and randomly divided into four groups Selectsynch (Group 1), Progesterone+Ovsynch (Group 2) nutritional supplement (Group 3) and conventional feeding control (Group 4) with each group consisting of twelve ewes.
In Selectsynch group, each ewe was administered with GnRH analogue (4.0 μg) on day 0 and PGF2α analogue (125 μg) on day 7 intramuscularly. In Progesterone+Ovsynch group, progestrone sponge was inserted intra-vaginal and GnRH analogue @ 4.0 μg was administered along with sponge insertion on day 0. On day 7 PGF2α analogue cloprostenol (125μg) was administered intramuscularly and the sponge was removed and second injection of 4.0 μg GnRH analogue was administered on day 9. In feed supplement group, each ewe was given 200 gm of additional concentrate feed along with 20 gm of mineral and vitamin mixture for 9 days along with regular concentrate feed. The control group ewes were maintained on conventional feeding and grazing.
The estrus response rate was 66.66, 100.00, 50.00 and 33.33 per cent in group 1, 2, 3 and 4, respectively. Significantly (P˂0.05) shorter time interval to onset of estrus (hrs) was observed in Progesterone+Ovsynch (38.00±4.63) group followed by Selectsynch (45.00±7.08), nutritional supplement (56.00±8.00) and control group (90.00±18.00) groups. The mean duration of estrus was 24.00±4.82, 26.00±2.88, 24.00±1.64 and 24.00±2.01 hrs in Groups 1, 2, 3 and 4, respectively without significant difference (P>0.05) among treatment groups but with significantly intense estrus (P<0.05) in Progesterone+Ovsynch (8.60±0.47) group than in Selectsynch (7.50±0.65), nutritional supplements (6.10±0.24) and control (5.00±0.22) groups.
Significantly (P˂0.05) higher conception rate was recorded in Progesterone+Ovsynch group (66.66%) when compared to Selectsynch (50.00%), nutritional supplement (33.33%) and control (25.00%) groups. The overall percentage of conception rate by using ultrasonography was 39.58% (19/48) Vs 43.75% (21/48) non-return basis among all treatment groups.
In the present study it was observed that Progesterone sponge plus Ovsynch treatment achieved higher estrus response rate with higher conception rate when compared to other treatments during non-breeding season in Vizianagaram anestrous ewes.
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