Study on the energy requirements of korean native growing and fattening cattle

Ahn, D.W.; Ahn, B.H.

Korean Journal of Animal Science 27(4): 217-221

1985


Accession: 006531061

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Abstract
This experiment was carried out to investigate the effect of energy levels on performance and energy requirements of Korean native steers. Twelve Korean native steers initially averaging 200 kg were allotted randomly into treatments. Experimental period was divided into 3 stages such as 200 to 250 kg for period 1, 250 to 350 kg for period 2 and 350 to 450 kg for period 3. Three energy levels (2.4, 2.6 and 2.8 Mcal/kg of diet) were employed for each period and protein content of diet was isonitrogenous to all energy levels, that is, 12% for period 1, 11% for period 2 and 10% for period 3. The results obtained were as follows. Total body gain was not significantly different from each energy level but daily body gain was significantly (P < 0.05) higher in steers fed 2.6 Mcal energy level than in steers fed 2.4 and 2.8 Mcal energy levels. Total and daily feed intake were significantly (P < 0.05) higher in steers receiving 2.4 Mcal energy level compared with 2.6 and 2.8 Mcal energy levels. Overall feed efficiency was greatly (P < 0.01) improved in steers receiving 2.6 and 2.8 Mcal energy levels as compared with in steers fed 2.4 Mcal energy level. Total energy intake was much lower in steers fed 2.4 and 2.6 Mcal energy levels than in steers fed 2.8 Mcal energy level. However, daily energy intake was not different from each energy level. Ratio of feed to body weight was decreased by 0.2 and 0.3% when body weight increased by 50 kg between 200 and 450 kg. ME required for kg body gain was 17.25 Mcal in steers fed 2.6 Mcal energy level and lower than in steers fed 2.4 and 2.8 Mcal energy levels. Therefore, it can be concluded that 2.6 Mcal energy level was adequate to support maximum performance for Korean native steers averaging 200 to 450 kg body weight.