COMPARATIVE STUDY ON PRODUCTIVE AND REPRODUCTIVE PERFORMANCE OF THREE CROSSBRED DAIRY GENOTYPES IN CHITTAGONG METRROPOLITAN AREA

Abstract

The Study has been conducted to compare the productive and reproductive performance of crossbred dairy cows at some selected dairy farms in Chittagong Metropolitan Area. The survey was conducted for a period of three months from July to September, 2008. A total of 110 Crossbred dairy cows belongs to three different cross ,. Friesian x Local (n=73), Sahiwal x Friesian (n=20) and Sahiwal x Local (n=17) were selected and their information regarding milk yield and other reproductive parameter were collected from farm record for a period of last five years (2003- 2008). Results showed that the average daily milk production Friesian x Local, Sahiwal x Friesian and Sahiwal x Local, 6.58± 0.59, 6.8 ± 0.43 and 3.3 ± 0.28 liter respectively.The Milk yield was differ significantly (P<0.5) between three cross bred.. Highest milk yield(6.8 ± 0.43 ) was observed in Sahiwal x Friesian and lowest milk yield (3.3 ± 0.28) in Sahiwal x Local. The average calving interval of Fresian x Local, Sahiwal x Friesian and Sahiwal x Local was 460.65 ± 14.20, 446.61 ± 22.79 and 406.88 ± 29.38 respectively. The average lactation length of Friesian x Local , Sahiwal x Friesian and Shahiwal x Local was 289.88±1.44, 285.0±0.0, 285.0±4.18, and 282.08±2.42 days respectively. The average calving interval and lactation length of the crossbred cows did not differ significantly (P>0.05 The average post partum heat period of Friesian x Local, Sahiwal x Friesian and Sahiwal x Local was 111.43 ± 5.89, 102.05 ± 10.19 and 94.29 ± 11.09 respectively The average Service per conception of, Friesian x Local, x Friesian x Sahiwal and Sahiwal x Local was 2±0.16, 1.73±0.18,and 1.6±0.19, days respectively. The postpartum heat period and service per conception cows did not differ significantly (P>0.05).,. The reproductive performance of Sahiwal x Local cows was superior whereas milk yield of Friesian x Sahiwal was superior the rest of the crossbred..