Effect of supplemental fish meal on the lactation and reproductive performance of dairy cows.
The influence of high protein diets (21% CP, DM basis), containing varied percentages of RUP, on lactation performance and fertility was evaluated. Sixty-two Holstein cows (65% multiparous) were blocked by age and randomly assigned to a 2 x 2 x 2 factorial design from d 12 to 125 postpartum. Factor 1 was 0 or 3.5% fish meal diet, factor 2 was location (Calan door versus free stall), and factor 3 was parity (first versus second or later). The soybean meal diet consisted of alfalfa hay, corn silage, barley, and soybean meal. The fish meal diet contained 3.5% fish meal (ruminant grade menhaden) that replaced a portion of the soybean meal. Cows fed the fish meal diet (40% RUP) had DMI, BW, and body condition similar to those of cows offered the soybean meal diet (34% RUP). Cows receiving the fish meal supplement tended to have higher milk protein production throughout the trial, higher milk production during the first 6 wk, and significantly lower ruminal ammonia concentrations than cows receiving the soybean meal diet. Differences in reproductive performance were not significant except for a diet by housing location interaction for conception rates from first AI.
Carroll
D J
DJ
Department of Animal Sciences, Oregon State University, Corvallis 97331.
Hossain
F R
FR
Keller
M R
MR
D000641:Ammonia / Q000378:metabolism; D000821:Animal Feed; D000818:Animals; D001806:Blood Urea Nitrogen; D002417:Cattle / Q000502:physiology*; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism; D004734:Energy Metabolism / Q000502:physiology; D005232:Fatty Acids, Volatile / Q000378:metabolism; D005260:Female; D005396:Fish Products; D007774:Lactation / Q000502:physiology*; D008892:Milk / Q000737:chemistry; D012098:Reproduction / Q000502:physiology*; D012417:Rumen / Q000378:metabolism; D013223:Statistics as Topic
D004044:Dietary Proteins; D005232:Fatty Acids, Volatile; D000641:Ammonia