A study on the residual feed intake and performance of lactating crossbred cows fed silage based total mix ration
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Date
2016
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Guru Angad Dev Veterinary and Animal Sciences University, Ludhiana
Abstract
Twenty four lactating crossbred cows with average milk yield of (14.09 kg/day) and average days in milk were of (53 days). These were divided in two groups of twelve animals each based on feeding practice i.e. 60:40 (RLC) and 50:50 (RHC). Twelve cows were divided into further two groups of six animals each, one receiving ration as TMR and the other as NON-TMR (control). The intake of OM, ADF, and NDF was significantly (P<0.05) higher in RLC whereas CPI was significantly (P<0.05) high in RHC irrespective of feeding practice. Level of concentrate and had no effect on intake of other nutrients. TMR and NON-TMR had non-significant effect on nutrient intake by the lactating crossbred cows. Nutrient digestibility of RHC was significantly (P<0.05) higher for CP, EE as compared to RLC and that of ADF was significantly (P<0.05) higher in RLC. The mode of feeding either as TMR or NON-TMR affected nutrient digestibility significantly (P<0.05); being the apparent digestibility of DM, CP, EE, ADF, NDF and TDN value significantly higher (P<0.05) in TMR compared to NON-TMR rations. The milk yield and protein yield of RHC was significantly (P<0.05) higher than RLC .The TMR had significantly (P<0.05) positive effect on milk yield, milk energy yield and FCM yield. No significant effect of level of exotic inheritance , roughage to concentrate ratio and season of calving on RFI although the RFI was lower in exotic inheritance level of 0.75 to 0.87 group indicating better efficiency of this group for milk production.TMR had significantly (P<0.05) lower RFI as compared to NON-TMR indicating better efficiency in TMR groups. The correlation of RFI with DMI, OMD, DMD, AFMD, EED, NDFD, TDN, DCP, DE, ME, NE, MEI, NEI was negative and significant (P<0.05).The correlation of RFI with MBW, fat yield, protein yield, FCM was positively significant (P<0.05). RFI with milk yield was significantly (P<0.05) and negatively correlated