Effect of feeding protected protein on the performance of lactating crossbred cows and heifers
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Date
2004
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MPUAT, Udaipur
Abstract
The study was carried out at the Livestock Farm, Rajasthan College of Agriculture, MPUA&T, Udaipur (Rajasthan) in two experiments to assess the effect of feeding protected protein on the performance of lactating crossbred cows and heifers.
EXPERIMENT I :
Fifteen lactating crossbred cows in early stage of lactation were divided into three groups of five animals each and randomly allotted to three dietary treatments as follows :
All the animals were offered wheat straw ad lib. + 5 kg green berseem. In treatment T1 animals were given untreated GNC, while in treatment T2 and T3 FA treated @ 0.5 g FA/100 g CP and FA treated @ 1.0 g FA/100 g CP respectively as a source of protein in the concentrate mixture was given.
No effect of feeding protected protein on daily DMI was in evidence in lactating crossbred cows. However, DMI/100 kg body weight and per kg W0.75 was significantly (P<0.01, P<0.05) affected by protected protein feeding.
Non-significant differences were observed between treatments for daily CPI, CPI per 100 kg body weight and per kg metabolic body size. Similar, results were also observed for DCPI. The intake of TDN (kg/d) was similar among the different groups. The TDNI per 100 kg body weight and TDNI per kg W0.75 was significantly (P<0.01) higher in T3 treatment as compared to T2 and T1 treatments. However, non-significant difference was observed in TDNI per kg W0.75 between T2 and T1 groups. The VWI and TWI was significantly (P<0.01) higher in T3 as compared to T2 and T1. However, between T2 and T1 were non-significant group cows. Similar, trends were also observed in VWI/kg DMI and TWI/kg DMI. The digestibility coefficient of all nutrients except CF had non-significant variation between the treatments. However, CF digestibility was significantly (P<0.01) higher in T3 (64.58 %) as compared to T2 (61.64 %) and T1 (59.47 %). The daily milk yield was 7.38, 7.16 and 8.83 kg in T1, T2 and T3 groups, respectively. The daily milk yield was significantly (P<0.01) higher in T3 a compared to T2 and T1 groups but, non-significant differences were observed between T1 and T2. T3 group cows produced significantly (P<0.01) higher milk yield by 19.65 per cent during whole experimental period than the (T1). The fat per cent was significantly (P<0.05) higher in T3 group as compared to T1. However, no significant differences in fat per cent between T3 and T2 on one hand and T2 and T1 on other were observed. The feed conversion efficiency was not influenced by formaldehyde treated GNC in the ration. The feed cost per kg milk yield was Rs. 6.42, 6.73 and 5.75 in T1, T2 and T3 treatments, respectively.
EXPERIMENT II:
Eighteen crossbred heifers were divided into three groups of six animals each and allotted to three dietary treatments as follows :
All the animals were offered wheat straw ad lib. + 5 kg green berseem. In treatment T1 animals were given untreated GNC, while in treatment T2 and T3 FA treated @ 0.5 g FA/100 g CP and FA treated @ 1.0 g FA/100 g CP respectively as a source of protein in the concentrate mixture was given.
Effect of different dietary treatment groups on average daily DM, CP, DCP and TDN intake were non-significant. The CP intake per 100 kg body weight was significantly (P<0.05) higher in T1 as compared to T3 group. However, the differences between treatments T2 and T3 on one hand and T2 and T1 on other were non-significant. The CPI per kg metabolic body size was significantly (P<0.05) higher in T1 as compared to T2 and T3 groups. Whereas, no significant differences in T2 and T3 groups were in evidence.
The VWI and TWI were significantly (P<0.05) influenced by the treatments. The VWI in T3 was significantly (P<0.05) higher than T2 and T1. However, non-significant difference were found between T2 and T1 groups.
The differences in digestibility coefficient for DM, OM, CP, CF and NFE except EE were non-significant among the different groups. However, EE digestibility was significantly (P<0.05) higher in T3 than T1 group, but at par for T3 and T2 and T1 and T2. Average body weight gain was significantly (P<0.01) higher in T3 as compared to T2 and T1 groups, but non-significant differences were seen between T1 and T2 group. T3 group recorded 24.30 per cent increase in growth rate over the group fed untreated GNC (T1). Feed conversion efficiency of DMI and TDNI per kg body weight gain were non-significant among the different groups. CP intake per kg body weight gain was significantly (P<0.05) lower in T3 group heifers than T1 group heifers. However, non-significant differences were observed between T1 and T2 on one hand and T3 and T2 on other. The cost of feeding per kg live weight gain was lowest in T3 group (Rs. 33.53) followed by T2 (Rs. 36.66) and T1 (Rs. 38.78) groups.
Based on the results obtained it is concluded that formaldehyde treatment (@ 1.0 g FA/100 CP) of GNC should be taken up by the feed industry on a commercial scale for manufacturing bypass protein, as the feeding of treated GNC proved beneficial in improving milk yield and fat percentage in lactating crossbred cows and growth rate in heifers
Description
Effect of feeding protected protein on the performance of lactating crossbred cows and heifers
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Citation
Yadav and Choudhary, 2004