Shukla, K. P.Singh, Jhamman2018-07-042018-07-041983http://krishikosh.egranth.ac.in/handle/1/5810056896A study on persistency of milk production in Gir cattle was undertaken at Cattle Breeding Farm, Gujarat Agricultural University, Junagadh Campus. Weekly milk yields upto 45th week of 595 lactations of 225 cows were analysed. The average weekly and daily peak yield was 59.68 and 9.53 kg, respectively. The average week and day to attain peak yield was 10.53th week and 61.25th day after calving, respectively. The peak yield and time required to attain the peak yield differed significantly between lactations. With increase in parity the peak yield was increased and time required to attain peak yield decreased.The lactation order and season of calving had significant effect on frequency distribution of cows for reaching their weekly peak yield. 80.67% cows reached their weekly peak yield within 15 weeks of lactation.enLIVESTOCK PRODUCTIONA STUDYThesis