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Utilization of Ruminally Infused Acetate or Propionate and Abomasally Infused Casein by Lactating Goats^1,2,3,

West Virginia University, Morgantown 26506

ABSTRACT

Four lactating Toggenberg goats (40 kg) were in a 4 x 4 Latin square design with the following treatments: 1) abomasally infused casein + ruminally infused propionate, 2) abomasally infused casein + ruminally infused acetate, 3) abomasally infused saline + ruminally infused propionate, 4) abomasally infused saline + ruminally infused acetate.

An average of 1194 g/day of a 70% Kentucky bluegrass and 30% concentrate diet containing 14.4% crude protein was fed in hourly proportions. The diet plus infusates was formulated to meet energy requirements for maintenance and lactation. Experimental periods consisted of a 5-day preliminary period followed by a 5-day collection period during which feces, milk, and urine were collected. Digestibility of nitrogen and urinary nitrogen excretion were increased significantly by casein infusions. Retained nitrogen tended to be greater for casein treatments. Milk production was increased significantly by infusion of casein. Propionate infusions decreased and acetate infusions increased milk fat. Milk protein yield tended to be larger because of infusion of casein. Yields of milk fat and 4% fat-corrected milk were larger on casein-acetate than saline-acetate treatment, suggesting synergism between casein infused abomasally and acetate infused ruminally.

¹ This project was supported in part by Eli Lilly Co., Greenfield, IN 46140 and published as Paper No. 1780 in the scientific article series of the West Virginia Agricultural and Forestry Experiment Station. The mention of a trade name, proprietary product, or specific equipment does not constitute a guarantee or warranty by the WVAFES and does not imply its approval or endorsement to the exclusion of others that may be suitable.

² The authors acknowledge the assistance of W. V. Thayne in the statistical analysis of the data.

³ Division of Animal and Veterinary Sciences.

⁴ Department of Dairy and Animal Sciences, Pennsylvania State University, University Park, PA 16802.

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