Effect of the Physical Profile of the Dietary Particles on Intake and Production Parameters of Dairy Cows

Revista Brasileira de Zootecnia

Pereira, José Carlos²  Bezerra, Edinaldo da Silva¹  Maldonado, Fabiana²  Queiroz, Augusto César de²  Paulino, Mário Fonseca² 

[1] Universidade Federal de Viçosa, Viçosa

关键词: fiber;    feed intake;    dry feed conversion;    physical profile;    performance    Introdução Em alimentação de ruminantes;    a ingestão de matéria seca é um dos aspectos mais importantes a serem considerados na formulação de dietas;    por causa da sua estreita relação com o desempenho produtivo e reprodutivo;   

DOI  :  10.1590/S1516-35982002000600023

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The objective of this experiment was to evaluate the effects of different dietetic physical profile on the performance of lactating dairy cows. Ten Holstein dairy cows (avg. 550 kg) were allotted to a switch back experimental design in three successive periods. The animals were individually housed in a tie stall and fed with total mixed rations constituted by Tifton hay (50,4%) and concentrated (49,6%). The Tifton hay was ground in commercial miller and sieved at 3,2; 4,8; 7,9; 15,9 and 25,4 mm mesh and samples from each grinding were screened through the Particles Separator Model Penn State for the determination the profile of particle distribution. Five treatments were constituted: T1¾100% of particles below 8 mm; T2¾76% below 8 mm and 24% between 8 and 19 mm; T3¾36,7% below 8 mm, 26,6% between 8 and 19 mm and 36,7% above 19 mm; T4¾32% below 8 mm, 28% between 8 and 19 mm and 40% above 19 mm; T5¾26% below 8 mm, 28% between 8 and 19 mm and 46% above 19 mm. The results indicated that diet and nutrient intakes as well feed conversion were not affected by the different diet physical profile, but changes in the milk production and composition were observed. It was observed that dairy cows fed with an intermediary dietary distribution profile yielded more milk. Milk fat yielded was not affected by dietary fiber particle distribution profile however dairy cows fed with diets of higher physical profile yielded a higher milk fat content. The processing of the diet ingredients, with reduction in the particle size, should be carefully considered once the best performance response was observed when the animals were submitted to the diets with intermediary physical profile.

【 授权许可】

CC BY-NC