Energy supplementation to dairy cows grazing Italian ryegrass with high-herbage allowance

Revista Brasileira de Zootecnia

Ribeiro Filho, Henrique Mendonça Nunes²  Thaler Neto, André²  Heydt, Maicon Saulo²  Semmelmann, Cláudio Eduard Neves¹ 

[1] UFRGS;Universidade do Estado de Santa Catarina, Lages, Brasil

关键词: efficiency of supplementation;    herbage intake;    Lolium multiflorum;    ground corn;    milk yield    Introdução A forragem pastejada é a forma mais prática e econômica de se fornecer energia e proteína para os herbívoros ruminantes;   

DOI  :  10.1590/S1516-35982007000900027

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

The effect of a energy supplement (corn grain) on the herbage intake and milk yield of lactating dairy cows grazing italian ryegrass (Lolium multiflorum) was evaluated. The treatments were 2 and 4 kg of ground corn/cow.day. Eight Holstein cows in the second third of their lactation were divided in two groups in switch back procedure. The expected herbage allowance was 35 kg/cow.day in rotational grazing system. Individual herbage intake was estimated from output fecal and the digestibility of the selected herbage. The characteristics of the pre-grazing herbage and post-grazing characteristics did not change between paddocks. The herbage OM digestibility was 76.1 ± 2.77 %. The herbage OM intake (13.5 ± 1.89 kg/day), daily milk yield (22.5 ± 0.92 kg/day), milk fat content (32.4 ± 2.55 g/kg) and milk protein content (28.5 ± 0.82 g/kg) did not differ with the supplementation levels. Dairy cows with a milk production potential of 22.5 kg/day, after milk production peak, grazing annual italian ryegrass pasture with high forage offer, did not respond to more than 2 kg of ground corn grain.

【 授权许可】

CC BY-NC