Pasture protein and soluble carbohydrate levels in spring dairy pasture and associations with cow performance
作者： Moller S , Wilson Gf , Matthew C
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摘要: In an observational study of nine commercial dairy herds over two springs (four in 1990 and five 1991) where cows grazed pasture alone,negativeasscciations werefoundbetween blood(ormilk) urealevelsandmilkfatandmilkproteinproduction,andpositiveassociations urea levels with protein to soluble carbohydrate (N/Sol.CHO) ratios. Statistical analyses using principal component analysis datasets from spring 1991 indicated that a high proportion variation (73% 1990, 33% the variables measured was explained by above relationships. Analysis variance PC scores showed these relationships were between-farm effects not related seasonal change time (p < 0.001). Additional data 35 September 199 1 also supported associations found. Reproductive performance (conception rate submission AB mating) associated negatively levels. Variations nutrient composition during am presented. The correlation between N/Sol.CHO ratio milk (r-0.69). Further work is needed clarify cause effect
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