Nutrient utilization, energy balance and productive performance of crossbred cows fed on different concentrate to roughage ratios in ration

Girdhar, N.; Haque, N.; Saraswat, M.L.; Khan, M.Y.

Indian Journal of Dairy Science 58(6): 426-429

2005


ISSN/ISBN: 0019-5146
Accession: 004455549

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Abstract
Energy balance and nutrient utilization studies were conducted on 12 crossbred milch cows weighing an average of 320 kg and yielding about 7 kg of milk per day. The animals were divided into two groups of 6 animals each and were fed with concentrate: roughage ratio of 60:40 (Group I) and 40:60 (Group II), respectively. The various ingredients of concentrate mixture consisted of maize grain, wheat bran, deoiled groundnut cake, mineral mixture and common salt. The ingredients were mixed in different proportions for Groups I (Conc. A) and II (Conc. B), taking into consideration the protein and energy requirements (NRC, 1989) for milk production. The green fodder offered was maize. A 7-day metabolism trial was conducted after a feeding period of about 35 days, followed by open circuit respiration chamber studies for each animal. Dry matter intake (DMI) was 132.0+or-3.07 and 124.2+or-5.39 g/kg W0.75/day in Groups I and II, respectively. The digestibility coefficients of dry matter (DM), organic matter (OM) crude protein (CP), neutral detergent fibre (NDF) and acid detergent fibre (ADF) did not show significant (P>0.05) differences between the groups. Digestibility of ether extract (EE) was significantly (P<0.05) higher in Group II, whereas that of nitrogen free extract (NFE) was significantly (P<0.05) lower than that of Group I. The animals of both the groups were in positive N balance. The fat corrected milk (FCM) yield was 7.4 and 7.7. kg in Groups I and II, respectively. The digestible energy (DE), metabolizable energy (ME) and methane energy as percent of gross energy (GE) were 62.6+or-1.23, 60.3+or-1.92 and 54.7+or-1.05 and 52.4+or-1.85, 4.95+or-0.50 and 4.66+or-0.15 in Groups I and II, respectively. Heat production was 188.9+or-8.21 and 207.4+or-9.83 kcal/kg W0.75/day in the respective groups. Energy balance (including milk energy) was significantly (P<0.05) higher in Group I compared to Group II. There was a significant difference (P<0.01) in the energy balance for tissue gain, which indicates that the cows fed with higher concentrate (60%) have more energy available for tissue gain.