Abstract
A feeding trial with 18 Murrah buffalo heifers (238 ± 63 kg; 1.7 ± 0.4 years old) was conducted for 57 days, and feed intake and body weight were recorded followed by 7 days of urine and feces collection. Heifers were grouped into low (RFI-I) and high (RFI-II) feed efficiency groups by regressing DMI (g head−1 day−1) on BWG (g head−1 day−1) and mid-test MBW (kg). RFI-II heifers had slightly higher DMI (g head−1 day−1 and expressed per unit of BW, %BW, MBW, mid-test BW, and mid-test MBW) and all associated nutrient intakes, BWG, feed efficiency traits (FCR, CPCR), digestibility of nutrients, and retentions of crude protein and fat over RFI-I heifers. The corresponding intake values (kg head−1 day−1) for RFI-I versus RFI-II were the following: DMI (6.73 ± 0.56 vs 6.51 ± 0.50), CPI (0.99 ± 0.008 vs 0.97 ± 0.07), DOMI (5.06 ± 0.47 vs 5.11 ± 0.42), and TDNI (4.95 ± 0.47 vs 5.00 ± 0.42). BWG (669 ± 52 vs 776 ± 47 g head−1 day−1), feed efficiency traits (FCR: 10.32 ± 1.16 vs 8.77 ± 1.04 and CPCR: 1.52 ± 0.17 vs 1.30 ± 0.16), N balance (38 ± 9 vs 45 ± 8 g N head−1 day−1), and protein and fat retentions (239 ± 57 vs 282 ± 51 g CP head−1 day−1 and 430 ± 6 vs 494 ± 59 g fat head−1 day−1) of RFI-I were less than RFI-II heifers, respectively. Based on the predicted RFI values, RFI-II buffalo heifers could be selected for feed efficiency.
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The authors acknowledge the Dairy Cattle Nutrition Division of the National Dairy Research Institute of India; Department of Agricultural Research and Education under the Ministry of Agriculture and the Office of Director General of ICAR; Department of Science and Technology, Government of India; and Felicitation by Federation of Indian Chamber of Commerce and Industry (FICCI) for funding the research.
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The feeding and digestibility trials were conducted with acceptable ethical standards.
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Negesse, T., Datt, C. & Kundu, S.S. Variability in residual feed intake and nutrient utilization in Murrah buffalo heifers. Trop Anim Health Prod 48, 1577–1584 (2016). https://doi.org/10.1007/s11250-016-1130-6
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DOI: https://doi.org/10.1007/s11250-016-1130-6