Nutrient Requirement for Ongole Grade Heifers
Abstract
This study aimed to observe the nutritive standard for Ongole grade heifers. Forty-eight heifers were randomized and housed in individual pens. The heifers were allotted to one of four crude protein (CP) levels (A.140; B.155; C.170 and D.185% of the NRC 1996 for growing cattle with the targeted live weight gains (LWGs) were 0,68 kg/d) with six replicates. The duration of the study was 14 weeks. The feed was 70% concentrate diet and 30% elephant grass on a dry matter (DM) basis. The parameters were LWG, body condition score (BCS), feed intake, volatile fatty acid, rumen characteristics, glucose, and blood urea nitrogen. Live weight was measured fortnightly, the BCS was observed at the start, mid, and end of the study. The results showed that DM intake was different between treatments (P<0.05), the DM digestibility did not differ between treatments (P>0.05). The LWGs for every treatment were 0.62, 0.58, 0.84 and 0.62 kg/d respectively. The BCS scores increased 1.08-1.42 points. The highest rumen pH was 6.3 in the C group. The glucose level was 48.17-55.50 mg/dl. The blood urea nitrogen concentrations were 46.67-56.33 ng/dl. To conclude, achieving 0.68 LWG in Ongole grade heifers requires 1.7 CP of NRC 1996 recommendation.
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