Influence of dietary fat, L-carnitine and niacin on milk yield and milk composition of dairy cows in midlactation

Main Article Content

A. R. Tasdemir
M. G?rg?l?
U. Serbester
Y. Yurtseven

Abstract

Two studies were conducted to evaluate the effect of dietary fat, L-carnitine, and niacin on milk production and milk composition in midlactation dairy cows. Eight multiparous lactating dairy cows were used. The studies were carried out with 2x2 factorial arrangements in a
4x4 Latin square design. The treatments in the fat and L-carnitine study (FLC) were: 1) no fat (NF) and no L-carnitine, 2) no fat and
0.045 % L-carnitine, 3) 3.6 % fat (as fed) and no L-carnitine, and 4) 3.6 % fat and 0.045 % carnipass. In the L-carnitine and niacin study
(LCN), rations containing dietary fat (3.6 %) were used for all treatments and treatments were: 1) no L-carnitine and no niacin, 2) no Lcarnitine and 0.045 % niacin, 3) 0.045 % carnipass and no niacin, and 4) 0.045% carnipass and 0.045% niacin. In the FLC study, dietary
fat increased milk yield (P <0.05) and tended to increase milk NPN content (P =0.10) and improved milk production efficiency (milk yield/dry matter intake, P < 0.01). In contrast, milk fat, milk protein, true protein and casein nitrogen (P < 0.05) were reduced by dietary
fat. L-carnitine resulted in decrease in milk yield and casein yield (P < 0.05) in the FLC. In connection with milk yield; protein yield had a tendency to decrease (P =0.08) by L-carnitine. Only non-fat solids are affected (P < 0.01) by the interaction between the dietary fat and L-carnitine. Milk yield and milk production efficiency also tended to be lower (P = 0.12 and P = 0.07) with L-carnitine in the LCN study. Niacin had no effect on milk yield and composition, except for the proportion of casein N to total N. The proportion of casein N to total N had a tendency to be higher (P =12) with L-carnitine and niacin separately. It could be concluded that dietary fat may increase milk yield and decrease milk fat, milk protein and L-carnitine supplementation may decrease milk yield, niacin supplementation did not affect with yield, composition and other parameters of diary cows in mid lactation fed a diet containing 60 % concentrate and 40% of alfalfa hay.
Key words: fat, L-carnitine, niacin, cow, milk yield, milk composition.

Article Details

How to Cite
Tasdemir, A. R., G?rg?l?, M., Serbester, U., & Yurtseven, Y. (2011). Influence of dietary fat, L-carnitine and niacin on milk yield and milk composition of dairy cows in midlactation. Cuban Journal of Agricultural Science, 45(2). Retrieved from https://cjascience.com/index.php/CJAS/article/view/128
Section
Animal Science
Author Biographies

A. R. Tasdemir

University of Cukurova, Faculty of Agricultural, Department of Animal Science, 01330 Adana, Turkey

M. G?rg?l?

University of Cukurova, Faculty of Agricultural, Department of Animal Science, 01330 Adana, Turkey

U. Serbester

University of Nigde, The Vocational School of Bor, Department of Animal Breeding, 51700 Nigde, Turkey

Y. Yurtseven

University of Harran, The vocational School of Ceylanpinar, Urfa, Turkey