Desempenho produtivo e parâmetros metabólicos de vacas leiteiras alimentadas com rações contendo silagem de milho e/ou sorgo
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2014-03-07
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Universidade Federal de Goiás
Resumo
The objective of this study was to evaluate milk production, consumption of dry
matter, ingestive behavior the digestibility and ruminal kinetics of crossbred
lactating cows fed rations whose fiber neutral detergent (NDF) corn silage was
replaced by NDF silage forage sorghum. It was 8 cows divided in two 4x4 Latin
square balanced. Each experimental period lasted 21 days, with 14 days of
adaptation and seven days of collection. The experimental isonitrogenous diets
were formulated to contain 38 % total NDF and 33 % NDF of forage. Increasing
levels of substitution of corn silage for NDF silage sorghum (0, 33 , 66 and 100 %
replacement ) were used . The in vitro NDF degradability of corn silage at 30 and
48 hours was higher than sorghum silage. The cud and chewing time expressed in
min/times of intake in min/d, min / kg DM and min/Kg of NDF was not affected by
the replacement levels. Replacement levels propitiated linear effect for rumination
min / kg DM and min / kg of NDF and chewing on min / kg of NDF and increased
linearly to chew on min / kg of DM. Replacement levels propitiated linear
increasing effect for dry matter and NDF (kg/d). The NDF and NDFi showed linear
increase. Replacement levels provided linear effect for DM digestibility in the total
tract. None of the related production and milk composition variables were
influenced by the progressive replacement of NDF corn silage NDF for sorghum
silage. The "pool size" of ruminal MN, MS and NDFi were not affected by the
replacement levels of NDF. There was a trend of linear increase to the rate of DM
disappearance and the passing rate of the NDFi. Replacement levels propitiated
linear effect for the renewal fee. There was no effe ct of the substitution for "mat"
and average ruminal pH of ruminal fluid. Under the conditions of this study corn
silage can be replaced by sorghum silage feeding without loss in animal
productivity.
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Citação
CAETANO, Leandro Batista Urzêda. Desempenho produtivo e parâmetros metabólicos de vacas leiteiras alimentadas com rações contendo silagem de milho e/ou sorgo. 2014. 61 f. Dissertação (Mestrado em Ciência Animal) - Universidade Federal de Goiás, Goiânia, 2014.