TY - JOUR AU - Habib, MA AU - Afroz, MA AU - Bhuiyan, AKFH PY - 2010/08/20 Y2 - 2024/03/28 TI - Lactation performance of Red Chittagong Cattle and effects of environmental factors JF - Bangladesh Veterinarian JA - Bangl. vet. VL - 27 IS - 1 SE - Articles DO - 10.3329/bvet.v27i1.5911 UR - https://www.banglajol.info/index.php/BVET/article/view/5911 SP - 18-25 AB - The present study was undertaken to estimate effects of environmental factors on<br />milk production traits in Red Chittagong Cattle (RCC). A total of 103 milk yield records<br />of 45 RCC cows obtained between 2005 and 2009 were analysed. Actual lactation yield,<br />lactation length, daily milk yield and dry period were estimated as 500.7 &plusmn; 19.3 kg, 259.6 &plusmn;<br />6.2 days, 1.9 &plusmn; 0.1 kg and 162.4 &plusmn; 7.7 days, respectively. Age and season corrected<br />lactation yield, 305 day milk yield and daily milk yield were estimated as 605.4 &plusmn; 22.9,<br />677.1 &plusmn; 19.4 and 2.2 &plusmn; 0.1 kg, respectively. Sex of calf and season of birth did not<br />significantly (P&gt;0.05) affect production, but lactation order significantly (P&lt;0.05) affected<br />production except lactation length. Year of birth had no effect (P&gt;0.05) on the traits<br />analysed except daily milk yield (P&lt;0.05). Calving age significantly (P&lt;0.05) affected<br />lactation yield but did not other traits. Cows in 5th lactation produced highest total (604.3<br />&plusmn; 69.3 kg) and daily milk yield (2.17 &plusmn; 1.8 kg). Cows aged 6 &ndash; 7 years had best lactation<br />yield (576.8 &plusmn; 60.5 kg).<br /><br />(Bangl. vet. 2010. Vol. 27, No. 1, 18 &ndash; 25)<br /><br />DOI: 10.3329/bvet.v27i1.5911 ER -