Effects of straw pellets on rumen function and live weight gain of beef cattle

doi:10.11686/cyxb2016129

Abstract

Abstract: The effects of different corn straw pellets on rumen function, apparent digestibility, rumen fermentation and weight gain of beef cattle were determined to assess the potential for increased use of straw in feed processing. Thirty 18-month old Simmental cross cattle with similar body weight were randomly divided into a control group and two groups fed straw, groupⅠ and group Ⅱ. Ten animals were allocated to each group. The control and groupⅠ groups were fed crushed corn straw and corn straw pellets at 50% of dietary fibre, respectively. Group Ⅱ was fed straw-concentrate pellets providing the same corn fibre intake as the groupⅠ diet. The results showed that ingestion, rumination and chew time of cattle fed straw pellets were shorter than that those fed crushed straw, and chew time per food ball of cattle fed straw pellets and ingestion time of group Ⅱ animals were significantly lower than the control group (P<0.05). There were no differences in apparent digestibility of diets in any group except for NDF (neutral detergent fiber) digestibility in groupⅠ which was significantly lower than the control group (P<0.05). Rumen fermentation differed among the three groups; groupⅠ had lower pH value and butyrate content in rumen gastric juice than the control group (P<0.05), but had higher acetate content and acetate/propionate ratio(P<0.05). There were significantly decreased butyrate content and increased acetate/propionate ratio and NH₃-N content in rumen gastric juice from group Ⅱ than that the control group(P<0.05). Higher daily weight gain and feed conversion rate were observed in groupⅠ and group Ⅱ animals(P<0.05); daily weight gain increased by 0.36 kg and 0.38 kg and feed conversion increased by 27.9% and 29.1% compared with the control group, respectively.

HU Jiang, WANG Yi, ZHAO Fang-Fang, LIU Xiu, QUAN Jin-Peng, NIU Xiao-Liang, HAN Xiang-Min. Effects of straw pellets on rumen function and live weight gain of beef cattle[J]. Acta Prataculturae Sinica, 2016, 25(10): 163-170.

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