Genetic studies on gestation period and it’s influence on first lactation milk yield in Jersey (J) × Red Sindhi (RS) crosses

Abstract

The present study was undertaken to find out the effect of gestation period on first lactation milk yield in Jersey (J) × Red Sindhi (RS) crosses at SHIATS dairy farm, Allahabad. A total of 135 records of Jersey × Red Sindhi crosses were grouped into four genetic groups viz. ¼ J × ¾ RS (G₁), ½ J × ½ RS (Gâ‚‚), 3/8 J × 5/8 RS (G₃), and 1/8 J × 7/8 RS (Gâ‚„). The records of cows having lactation length below 270 days were considered abnormal and hence not included in the study. It was concluded that the gestation period has significant effect on first lactation milk yield in Jersey (J) × Red Sindhi (RS) crosses. Similarly the cows of gestation period 270 to 280 days and 281 to 285 days had significant effect on first lactation milk yield hence due to consideration should be given at the time of selection or purchase of animals.