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Effects of feeding chopped-hay rations on lipid metabolism and milk fat production in high yielding dairy cows

Effects of feeding chopped-hay rations on lipid metabolism and milk fat production in high yielding dairy cows

Zentralblatt für Veterinarmedizin. Reihe a 32(8): 561-572

ISSN/ISBN: 0514-7158

PMID: 3936311

DOI: 10.1111/j.1439-0442.1985.tb01976.x

Fatty acid composition in milk fat and blood lipids was investigated during the feeding of long hay and chopped hay rations, whether or not supplemented with NaHCO3, in four high producing dairy cows. The ration consisted of 7 kg hay, 11 kg pelleted concentrates and 2 kg pelleted sugarbeet pulp. In a control period (19 days) long hay was fed. During a subsequent induction period (35 days) hay chopped to a length of 2.80 mm (2 cows) or 6.25 mm (2 cows) was fed. When a milk fat depression was found the ration was supplemented with 400 g NaHCO3 daily during the recovery period (35 days). Two cows developed milk fat depression, one on each hay-length. All cows showed decreased percentages of the fatty acid C 18:2 in the blood lipids during the feeding of chopped hay and the largest decreases were found in the milk fat depressed cows. Addition of NaHCO3 to the ration effected no substantial change in the fatty acid composition of the blood lipids. In three cows a decrease in C 18:1 and C 18:0 percentages in the milk fat was found during the feeding of chopped hay, while C 12:0, C 14:0 and C 16:0 percentages were increased. In two of these cows body weight increased considerably during this period and two cows showed elevated insulin activities. The fourth cow showed a large increase in the fatty acid C 18:1 percentage, a body weight loss, decreased insulin activities and a slightly increased plasma NEFA-concentration. These results suggest decreased lipolysis in the two milk fat depressed cows during the feeding of chopped hay. NaHCO3-added to the chopped hay ration resulted in a partial annulment of the changes in the fatty acid composition in the milk fat and decreased insulin activities, possibly by stimulating lipolysis.

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