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ABSTRACT...... The prostaglandin and its synthetic analogue are considered as drug of choice in reproductive management. A total of twenty Jaffrabadi buffaloes with reproductive disorders were selected from cattle breeding farm, Junagadh. All twenty buffaloes (Group I) were treated with single dose of Prostaglandin (synthetic analogue, clostrinol, 2 ml) while the animals which did not respond (Group II) to first injection of Prostaglandin were subjected to second injection of Prostaglandin 11 days after first treatment. A total of six animals (30%) responded to first dose of PGF 2 , while eight animals (57%) responded to second dose of PGF 2 . The mean time required for induction of heat in first and second group was 70.24 ± 1.44 hrs and 56.86 ±1.96. The mean duration of estrus proper in first group was 19.18 ± 0.69 hrs, while in second group the mean duration was 16.13±0.42 hr. The conception rate in the present study was 43.05 per cent for the first group of animals and 49 per cent for the animal that were treated with second dose of PGF 2 . In conclusion, administration of PGF 2  at eleven days interval causes faster heat induction and better conception rate.

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The records first lactation monthly test day milk yields of 213 Jaffarabadi buffaloes spread over a period of 24 years (1991 to 2014) maintained at Cattle Breeding Farm, Junagadh Agricultural University, Junagadh were used to predict first lactation 305 day or less milk yield using multiple linear regression model with backward elimination procedure. The data were collected at 30 days interval from 4th day till 304th day post calving. The accuracy of prediction model was calculated by estimating R2-value. Analysis carried out revealed that when all the monthly test day records (1 to 11) were incorporated in an equation to predict first lactation 305 day or less milk yield, the accuracy (R2-value) was maximum with 97.06%. However, early best prediction of 305 days milk yield based on monthly test day milk yields was found up to 6th monthly test day milk record. The optimum equation had total four variables viz. 2nd, 4th, 5th and 6th monthly test day milk yield records, which gave an accuracy of prediction of 78.28%. Therefore, it is concluded that first lactation 305 days smilk yield could be predicted as early as 6th month of lactation with higher degree of accuracy.

The present investigation was conducted to compare relative efficiency of four lactation curve models in Gir cattle. This study was carried out on 1246 normal lactation records (1-6 parity) pertaining to 357 Gir cows spread over 15 years (2001)(2002)(2003)(2004)(2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014)(2015)