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Effect of hay preservation method on milk production and composition of Holstein cows

Journal of Dairy Science 75(Supplement 1): 311

Effect of hay preservation method on milk production and composition of Holstein cows

30 high-yielding Holstein cows were used in a 35-day feeding trial to determine the response to diets containing lucerne-orchardgrass hay, which had been preserved in large round bales by (1) field drying (harvested at 18% moisture), (2) inoculated (harvested at 23% moisture, inoculated with a mixture of Bacillus megaturim, Pediococcus acidilactici and Pediococcus pentosaceus) or (3) artificially dried hay (harvested at 35% moisture and artificially dried using a solar heated forced-air drier). After 6 months storage in a pole barn, hay was chopped and included in experimental total mixed ration diets at 28% of DM. Cows were assigned to 1 of 3 treatment groups by parity after a 2-wk adjustment period. Cows given diets containing field-dried hay consumed more (P<0.05) concentrate and total DM than those given artificially dried or inoculated hay based on group intakes: 26.1, 24.6 and 24.4 kg/day resp. Milk yield, percentage fat and protein was not different (P>0.10) between treatments: 40.6 kg/day, 3.22 and 3.16%; 35.6 kg/day, 3.82 and 3.19%; and 39.1 kg/day, 3.56 and 3.04% resp. However, cows given solar-dried hay were more (P<0.05) efficient in converting DM into 3.5%-FCM: 1.48, 1.47 and 1.62 kg 3.5%-FCM/kg DM intake.

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Accession: 002356425

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