The development of some parameters of feed intake, milk and blood at the beginning of lactation in pairs of twin black pied cows

Sagathavan, S.

Entwicklung einiger Futteraufnahme , Milch und Blutparameter zu Laktationsbeginn bei schwarzbunten Rinderzwillingen: 147

1983


Accession: 001480984

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Abstract
In 2 yr, a total of 11 pairs of German Black Pied twin cows, 6 of them monozygotes, were studied from 6 wk before to 5 wk after calving. After calving, the diet had roughages (straw and grass cobs) and concentrates at 2:1 but diets in the 2 yr differed in energy and protein. DM intake increased after calving and was greatest with a higher diet energy concentration; cows were particularly sensitive to undernutrition with respect to energy in the 1st wk. The decrease in blood thyroxine at the beginning of lactation was greatest in highest yielding cows. Activities of aspartate aminotransferase and glucose dehydrogenase increased as energy intake increased. High blood bilirubin was associated with insufficient energy intakes; low milk protein yields were associated with low blood glucose. As lactation progressed, contents of C18:1, C18:2 and C18:3 acids in milk fat decreased and those of C8-C14 increased; the fatty acid content of milk was affected by energy intake. Cows with calving difficulties were lighter, ate less, lost more weight, had higher blood urea concn. and lower enzyme activities, and gave milk with more C18:1, C18:2 and C18:3 acids than cows with normal calvings. Genetic differences between pairs were manifested mainly through DM intake and milk yield.