Turkish Journal of Veterinary & Animal Sciences
Interaction between particle sizes of alfalfa hay and corn grain on milk yield, milk composition, chewing activity, and ruminal pH of dairy cows
The objective of this study was to determine the interactions between alfalfa hay and corn grain particle sizes on nutrient intake, milk yield, milk composition, chewing activity, and ruminal pH of dairy cows. Alfalfa hay was chopped either at 4 cm (long; L) or 1 cm (short; S) theoretical length of cut. Particle size of corn grain was obtained by grinding either at 1 mm (coarse; C) or less than 1 mm (fine; F) mean particle size. Four lactating multiparous Holstein cows were assigned in a 4×4 Latin Square design in a 2×2 factorial arrangement of treatments with 21-day periods. Intakes of DM (DMI) and NDF (NDFI) were not different among treatments averaging 23.6 and 10.6 kg/d. Similarly, yields of milk and milk protein were not different among treatments averaging 22.8 and 0.75 kg/d, respectively. However milk fat yield tended to be higher for C (0.82 kg/d) than F (0.73 kg/d) corn grain. An interaction trend was observed between particle sizes of alfalfa hay and corn grain for milk protein percentage where it tended to be higher for SC (3.31%) compared to SF (3.23%). Chewing activity was not affected by any treatment. Ruminal pH was higher at 9 h of post-feeding for both SF (6.50) and SC (6.36) compared to LF (6.06) and LC (6.17). The data indicate that particle size of alfalfa hay had no effect on milk yield and any milk composition but diets containing C corn grain resulted in a higher milk fat yield.
Particle size, alfalfa hay, milk yield, chewing activity, ruminal pH
BAL, MEHMET ALİ and BAL, E. BANU BÜYÜKÜNAL
"Interaction between particle sizes of alfalfa hay and corn grain on milk yield, milk composition, chewing activity, and ruminal pH of dairy cows,"
Turkish Journal of Veterinary & Animal Sciences: Vol. 34:
1, Article 12.
Available at: https://journals.tubitak.gov.tr/veterinary/vol34/iss1/12