The comparesion for performance of milk production and reproduction traits in breeds of Holstein and Brown Swiss

In this study data obtained from dairy farm of Golpayegan (Company of Zeraei) for milk production and reproduction traits belonged to breeds of Holstein and Brown Swiss. The traits included milk production, lactation length, dry period, open days, numbers of insemination per coception(coception rate), gestation length, birth weight , calving interval , age of first calving and beerding efficiency. Data analyzed by software of SAS and JMP belonged to 2144 heads of dairy Holstein within years of 1994 ¡V 2001 and 1481 dairy Brown Swiss cows in 1987 ¡V 2001. The results showed means of 5964_b2685 kg and 4401_b1963 kg for milk production, 325.1_b67.5 and 229.3_b64.4 days for lactation length, 86.3_b41 and 96.3_b45.1 days for dry priod, 126.6_b60 and 111.7_b53.7 days of open, 278.3_b7.9 and 286_b7.8 days for gestation length, 1.94_b1.4 and 1.78_b1.1 number of insemination, 44.3_b4 and 45.1_b4.4 kg for birth weight, 409_b67 and 397.5_b59 days of calving interval, 816_b88 and 835 _b86 days for age of first calving, 2.1_b1.3 and 2.5_b1.7 number of calving and 89.3_b15.74 and 92.3_b11.96 percent for breeding efficiency for Holstein and Brown Swiss,respectively. Sire , dam(sire), year, season, number of calving and lactation length showed highly significant effect on milk production(p0.01). Holstein and Brown Swiss dairy cattle showed higher significant effect were respectivly for second and forth number of calving and season of autumn and spring. Sire , dam(sire), year , season, number of calving and milk production highly significant effected on lactation length.Holstein and Brown Swiss dairy catlle showed higher lactation length in the first and fifth calving and seasons of winter and autumn respectively. Effects of sire(year) , year , season, number of calving , gestatoin length and sex of calves were highly significant(p0.01).Number of calving showed significant effect(p0.05) on birth weight in Holstein.Effects of sire , year , number of calving , gestation length, sex of calve , number of calving and gestation length highly significant(p0.01) in Brown Swiss dairy catlle .However ,season effect not significant. Highest birth weight for Holstein and Brown Swiss catlle observed at fifth and seventh calving and autumn season, respectivly.