Ruminal Degradability of Dry Matter and Neutral Detergent Fiber of Some Forages Used in Dairy Goat Diets Presenting Different Forage to Concentrate Ratio

Revista Brasileira de Zootecnia

Rodrigues, Marcelo Teixeira³  Queiroz, Augusto César de³  Gonçalves, André Luigi³  Henrique, Douglas Sampaio²  Lana, Rogério de Paula³  Vieira, Ricardo Augusto Mendonça¹ 

[1] Universidade Estadual de Goiás;Instituto Melon, Silvânia;Universidade Federal de Viçosa

关键词: fiber degradability;    in vitro technique;    in situ technique     IntroduçãoA avaliação de alimentos para o arraçoamento dos animais domésticos tem evoluído consideravelmente;    contudo;    informações concernentes à caprinocultura ainda são escassas;   

DOI  :  10.1590/S1516-35982001000700028

学科分类：兽医学

来源: Universidade Federal de Vicosa

【 摘 要 】

- The objectives of the present study were to characterize and determine the parameters estimative of kinetics of carbohydrate degradation of alfalfa hay, elephant grass, tifton 85 hay, and corn silage, in different ratios of roughage:concetrate, using both in situ and in vitro technique. Five non pregnant non lactating goats, rumen cannulated, and averaging 58 kg were used during the experimental periods. A modified McDougall buffer was used for the in vitro assay to adjust pH to the values observed in the animals, by adding 1M of citric acid solution according to the roughage:concentrate studied. A 5x5 Latin square was used to evaluate five treatments consisted of roughage to concentrate ratio of 100:0, 80:20, 60:40, 40:60 e 20:80. It is suggested a significant influence of level of concentrate on ruminal digestibility of forages for all fractions studied. Associative effects of roughage and concentrate resulted on increment of degradation in the pH range of 6.2 to 6.8. Conversely a decrease on degradability was observed as pH reached values bellow 6.0. Lag time decreased as pH changed from 7.05 to 6.8 and maintained stable until 6.5, and a significant increase on lag values was observed thereafter, being noticed higher values at pH bellow 6.0 for all forages. Both in situ and in vitro incubation resulted in degradation curves of dry matter that were similar in shape for all feed studied as well as for rates of degradation. Thus it was suggested that both methods can be considered reliable to predict the observed parameters.

【 授权许可】

CC BY-NC