Rumen fermentation, blood metabolism and milk production by dairy cows fed rice [Oryza sativa] whole crop silage
2008
Zhang, Y.(Tokyo Univ. of Agriculture and Technology, Fuchu (Japan)) | Kanda, S. | Kurokawa, Y. | Motobayashi, T. | Kamada, T. | Itabashi, H.
The objective of this study was to determine the effect of feeding rice whole crop silage (Oryza sativa L. cv. Kusahonami, RWCS) on milk production, rumen fermentation and blood metabolism. Six lactating Holstein cows were blocked and assigned randomly to one of two treatment diets containing 23 % RWCS or corn silage (CS) on a dry matter (DM) basis. The balance of the diets comprised 16% Sudangrass hay, 20% alfalfa hay cube and 41% concentrate. Both diets contained an average of 15% crude protein and 70% total digestible nutrients. Treatments were applied as a switchback design with two 14-d periods. Samples and data were collected during the final 3 d of each period. DM intake, milk yield and milk composition did not differ between RWCS and CS diets. The composition of fatty acids in milk fat was similar between the two diets, but the proportion of C18:2 tended to increase with the RWCS diet, and that of CLA (cis9, trans11-C18:2) was identical between the two diets. Treatments did not affect ruminal protozoal numbers and ammonia N. Although the concentration of ruminal total volatile fatty acids was unchanged, the proportion of acetic acid increased (P0.05), and that of propionic acid tended to decrease (P0.1) with the RWCS diet. Diet did not affect concentration of glucose and urea N in blood plasma, but that of some free amino acids was lower with the RWCS diet. These results suggest that RWCS could be well utilized as basic roughage as CS for lactating dairy cows.
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