Co-Authors:
Miron, J., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Adin, G., Department of Cattle Husbandry, Extension Service, Ministry of Agriculture, Israel, Department of Animal Science, Faculty of Agriculture, The Hebrew University of Jerusalem, Israel
Solomon, R., Department of Cattle Husbandry, Extension Service, Ministry of Agriculture, Israel
Nikbachat, M., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Zenou, A., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Yosef, E., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Brosh, A., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Shabtay, A., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Asher, A., Department of Animal Science, Faculty of Agriculture, The Hebrew University of Jerusalem, Israel
Gacitua, H., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Kaim, M., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Yaacobi, S., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Portnik, Y., Department of Dairy and Genetics Sciences, Agricultural Research Organization, Bet-Dagan, Israel
Mabjeesh, S.J., Department of Animal Science, Faculty of Agriculture, The Hebrew University of Jerusalem, Israel
Abstract:
This study measured the effects of replacing corn silage and vetch hay by soy hulls in total mixed rations (TMRs) fed to 25 pairs of cows through 90 d in milk, on dry matter (DM) intake, in vivo digestibility, milk yield and composition, onset of normal estrous activity, body condition score (BCS), health and the energy balance of lactating cows. The partitioning of metabolizable energy (ME) intake between heat production (HP) and retained energy (RE) in milk and body change of each cow was measured. The two TMRs differed in the content of forage and forage aNDFom [235 g/kg versus 350 g/kg; and 128 g/kg versus 187 g/kg DM, in the experimental (EXP) and control (CON) diets, respectively]. This was reflected by an increase in voluntary DM intake by 7.2% (P=0.02) in the EXP group as compared with the CON. In vivo DM and aNDFom digestibility were 4.9% (P=0.03) and 22.7% higher (P=0.01), respectively, in the EXP group than in the CON. The higher DM intake and digestibility of the EXP TMR were reflected by a concomitant increase of 7.4% in milk yield and 10.8% in RE (P=0.01) of the EXP cows as compared with the CON. The two dietary groups expressed similar somatic cell counts, and metabolic disorders (i.e., ketosis and/or lameness), as well as pedometer activity (steps/h) suggesting similar udder health, behavior and animal welfare. A trend to an earlier return to normal ovarian activity occurred in the EXP cows as reflected by fewer days to 1st ovulation and advanced outset of estrous cycle. Despite the higher RE of the EXP cows, the HP of both groups was maintained at an upper level of 141-136 MJ/cow/d during the 90 d of the experiment. © 2009.
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