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Influence of Pelleting Whole Cottonseed on Ration Digestibility and Milk Production and Composition

Animal and Dairy Science Department, University of Georgia, Athens 30602

ABSTRACT

Two trials were conducted to determine the effect of pelleting whole cottonseed on milk production and composition and ration digestibility. In trial 1, four multiparous Holstein cows were paired by production and used in a 2 x 2 reversal design with 37-d experimental periods. Cow receiving pelleted cottonseed produced 35.12 kg/d milk and 31.74 kg/d of 4% fat corrected milk as compared with 33.41 and 29.83 for cows receiving whole cottonseed. There were no significant differences in dry matter intake or milk composition between treatments. Yield of total solids and lactose was greater for cows receiving pelleted cottonseed as compared with whole cottonseed. Apparent digestibility coefficients for dry matter, gross energy, and crude protein were not different due to pelleting.

In trial 2, four ruminal and abomasally cannulated Holstein steers were paired in a 2 x 2 reversal design and fed either pelleted on whole cottonseed for 10 d followed by a 7-d collection. Steers receiving the pelleted cottonseed had higher intakes of gross energy and crude protein. There were greater amounts of total crude protein and crude protein in the particulate phase of abomasal digesta from steers receiving pelleted cottonseed as compared with whole cottonseed. Apparent digestibility for crude protein for the whole tract was not different due to treatment.

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