Broiler litter and supplement based on ruminal microbiota in dairy heifers diets: performance and economic evaluation

Revista Brasileira de Zootecnia

Silva, Paulo Roberto de Carvalho e¹  Oliveira, Ronaldo Lopes⁴  Pereira, José Carlos³  Cecon, Paulo Roberto³  Resende Filho, Moisés de Andrade² 

[1] Universidade Federal de Juiz de Fora;Universidade Federal de Viçosa;UPIS, Brasília

关键词: dairy cattle;    feed efficiency;    heifers;    weight gain     IntroduçãoA criação de novilhas de reposição constitui um dos pontos de estrangulamento da pecuária de leite no Brasil;    principalmente devido à falta de cuidados para proporcionar uma alimentação adequada para esses animais;    o que acarreta baixa taxa de crescimento e;    dessa forma;    atraso para iniciar a vida produtiva;   

DOI  :  10.1590/S1516-35982003000300017

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

This research was carried out to evaluate the performance of dairy heifers fed with broiler litter (BL) and ruminal microbiota supplement (RMS). Twenty heifers, crossbred Holstein x zebu, with average weight and age of 276 kg and 13,8 months, respectively, were used. The animals were randomly allotted to a 2x2 factorial scheme: two levels of BL (15 and 30% in the diet dry matter) and RMS (0 and 10 g/heifer/day), in a completely randomized design, with five replications. The feed intake, weight gain, feeding efficiency and costs were evaluated, and an cash flow for feedlot and grazing systems was simulated. The intake of dry matter, organic matter, crude protein and neutral detergent fiber were not different for BL and RMS. Daily weight gain was higher for heifers fed diet with 15% BL and 10 g of RMS (1.13 kg), in relation to 15%BL without RMS (0.85 kg), but without differences for animals receiving only 30% BL or SMR (1.09 and 0.97 kg). There were no differences in dry matter and neutral detergent fiber conversions, but there was an interaction between BL and RMS levels and efficiency of crude protein utilization. Cost/benefit ratio was better for the 30% BL level, without RMS. Simulated cash flow showed that the feedlot system was economically more advantageous than grazing system, for the condition of this work.

【 授权许可】

CC BY-NC