Milk yield and quality of crossbred dairy cows fed with different levels of vetch (Vicia dasycarpa) hay and concentrate on a basal diet of fresh cut napier grass (Penissetium purpureum)

This study was conducted to examine the effect of different levels of vetch hay (Vicia dasycarpa) supplementation on feed intake, milk yield and milk composition of 50:50 Boran-Freisian crossbred dairy cows fed a basal diet of napier grass (Penissetium purpureum). Five crossbred dairy cows at an early stage of lactation with average milk yield of 6 – 8 liters/cow/day and body weight of 390 ±15 kg (mean±STD) were arranged in a 5*5 latin square design. In the first 4 treatments, napier grass was fed ad libitum as basal diet, while in T5 (the control diet) native hay was the basal diet. In treatment 1, 2 and 3 vetch hay was supplemented at 20% (2.4 kg), 30% (3.6 kg) and 40% (4.8 kg) replacement of the total daily DM intake, respectively. In T4 and T5 concentrate mix (55% wheat bran, 43% noug seed cake (Gizotia abysinica) and 2% salt) was supplemented at the rate of 0.5 kg per liter of milk produced. Total dry matter intake differed among treatments in the order of T4>T3=T5>T2>T1. Milk yield was greater for concentrate supplemented treatments compared with the vetch supplemented ones, and was similar (P>0.05) among the different level of vetch supplemented groups. Milk fat and protein were not affected (P>0.05) by treatments. In general this study indicated that optimum milk production (8.81 liter/cow/day) can be obtained with the use of napier grass supplemented with 2.4 kg/cow/day vetch hay dry matter.