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PubMed1985

Effects of feeding corn or barley on composition of milk and diet digestibility.

Complete mixed, cubed diets containing corn or barley as the cereal component were fed to eight cows, four first lactation and four second or later lactation. Diets were fed for ad libitum intake in two periods of 21 d each. Percentages of milk fat, protein, lactose, and solids were not affected by corn or barley. Percentages of casein, whey, and nonprotein nitrogen were not different nor was proportion of total nitrogen represented as casein, whey, or nonprotein nitrogen for corn or barley diets. Production status, first lactation versus older cows, did not affect milk composition of casein, whey, and nonprotein nitrogen. Apparent digestibility of dry matter and energy was not different, but fiber digestibility was significantly lower for the barley diet. Intake of dry matter and digestible energy and yield of milk and milk constituents were not different. When diets were fed to rumen fistulated heifers, molar percentages of volatile fatty acids, total volatile fatty acid concentration, and pH of rumen fluid were not different for corn or barley diets.

Animal Feed↗
PubMed1976

Rapeseed meal in complete feeds for dairy cows.

Three complete feeds containing low glucosinolate, low erucic acid rapeseed meal (Cultivar "1788"), high glucosinolate, low erucic acid rapeseed meal (Cultivar "Span"), or soybean meal as protein supplement were evaluated with lactating Holstein cows in a double 3 X 3 Latin square design. Lactation performance, hematology, blood chemistry, serum-free amino acids, rumen volatile fatty acid concentrations, and milk fatty acid composition were measured. The 1788 ration tended to increase yield of milk and of total solids. Hematology, blood chemistry, and serum-free amino acid data showed no differencein utilization of nitrogen. Concentrations of volatile fatty acids were not different. Feeding of the high glucosinolate Span ration did not reduce feed intake. However, there were indications that Span-fed cows may have experienced hypothyroidism. No differences were in erucic acid content of milk fat, and concentrations were low. Rapeseed meals 1788 and Span and soybean meal were equal as protein supplements.

Amino Acids↗