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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1994;7(1): 69-74.
DOI: https://doi.org/10.5713/ajas.1994.69    Published online March 1, 1994.
Plasma concentration of L. thyroxine (T4), L. triiodothyronine (T3) and certain blood biochemical constituents in growing crossbred (bos taurus x Bos indicus) calves
D. C. Shukla, V. P. Varshney, P. S. P. Gupta, B. B. Mahapatro
The relationship of thyroid status and certain blood biochemical constituents with body weight gains (ADG) and age (13 to 96 weeks) was studied in Holstein Friesian 횞 Hariana (1/2F 횞 1/2H) crossbred male calves by assessing their plasma triiodo thyronine (T3), Thyroxine (T4), sodium. potassium, total proteins and cholesterol level at two energy levels. Body weight gains (ADG) were higher during the 50 to 72 weeks of age and declined thereafter. the plasma T3 conc. was aignificantly (p<0.01) higher during this period compared to all other periods. There was no significant variation due to energy level. Overall mean plasma T3 conc. was 1.19 0.12 ng/ml. Plasma T4 conc. did not show any significant variation either between the different age periods or between the two energy levels. The mean plasma T4 conc. was 37.34 1.32 ng/ml The plasma sodium and potassium concentration did not vary significantly due to energy levels. But amongst the different age periods, sodium concentration was highest (147.70 2.29 mEq/L) during 49-60 weeks of age and lowest (134.70 1.78 mEq/L) during 13-24 weeks, where as for potassium concentration changes were nonsignificant. There was very little variation amongst other periods. Plasma protein level was higher at 100% energy level than at 75%. Amongst the different age period, it was significantly lower (6.44 0.36) during 13 to 24 weeks of age than at 37 to 48 weeks of age (7.14 0.11). Plasma cholesterol values were higher for 75% energy level than that of 100%. between the periods it was highest during 61 to 72 weeks of age and the difference amongst the age period were highly significant.
Keywords: Crossbred; Blood Constituents; Growth; Thyroid
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