EFFECT OF FEEDING FORMALDEHYDE TREATED RAPE SEED MEAL TO LACTATING DAIRY ANIMALS
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Date
2008
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AAU, Anand
Abstract
The present experiment was planned and conducted to know the effect of feeding formaldehyde treated rapeseed meal in the concentrate mixture of lactating dairy cows. The feeding experiment was conducted on eighteen lactating crossbred cows (Gir x Holstein Friesian) with average daily milk production of 21 kg and average milk fat per cent 4.25 to 4.37 in the beginning of the study. The cows were grouped randomly in two treatments (T1 and T2) with nine cows under each treatment following completely randomized design. The cows under T1 (control group) were fed as per the feeding schedule of the farmers (Home made concentrate mixture + green roughage + dry roughage) according to milk production of cows. The cows under treatment group (T2) were fed control diet in which home made concentrate mixture was replaced by formaldehyde treated rapeseed meal on protein equivalent basis to make both diets isonitrogenous. Experimental feeding of individual cows was carried out for the period of 120 days. Average daily dry matter intake was found to be 17.46 and 16.68 kg/cows under T1 and T2 respectively. The treatment differences were found to be statistically non significant. The average values for concentrate: roughage ratio was 1:0.98 and 1:1.04 under T1 and T2, respectively. These treatment differences were also found to be non significant. Average daily CP, DCP and TDN intakes were found to be 2362.15 and 2317.07 (g/day/animal); 1372.30 and 1459.68 (g/day/animal) and 10.94 and 11.44 (kg/day/animal) under T1 and T2, respectively. The treatment differences for nutrients intake were found to be statistically non significant. The average daily milk production of cows under T1 and T2 was 20.17 and 21.32 kg, respectively. The daily increase in milk yield was found to be 1.17 kg for cows fed T2 diet in comparison to the cow fed control (T1) diet. The average daily 4% FCM yield was found to be 21.38 and 23.15 kg per animal under T1 and T2, respectively. The average milk fat content under T1 and T2 was 4.45 and 4.59 per cent, respectively and the treatment differences were significant (P<0.05). The values for daily milk fat yield were 0.895 and 0.981 kg under T1 and T2, respectively. However, the treatment differences for the same were statistically non significant. Total solids content of milk was 13.82 and 14.05 % under T1 and T2, respectively However, SNF content of milk was unaffected by bypass protein supplementation. The digestibility of proximate nutrients (except for ether extract) was higher in cows fed T2 diet as compared to that of cows fed with T1 diet. However, the differences among the treatment groups were non significant. Dry matter intake to produce one kg milk and 4% FCM was found to be 0.902 and 0.792 kg and 0.846 and 0.727 kg under T1 and T2, respectively (P < 0.05). Crude protein intake was found to be 125.43 and 117.46 g and 111.43 and 102.31 g to produce one kg milk and 4% FCM under T1 and T2, respectively. Similar values for DCP intake were 74.36 and 69.60 g and 68.82 and 66.55 g under treatments T1 and T2, respectively although the treatment differences were non significant. The intake of TDN to produce one kg milk was 0.590 and 0.553 kg under T1 and T2, respectively (P < 0.05) and similar values for FCM production were 0.519 kg and 0.477 kg, respectively (P < 0.01). The daily cost of feeding per animal was Rs 108.15 and 102.77 under T1 and T2, respectively. The daily cost of feeding (Rs/cow) was higher (P>0.05) under T1 than T2. The average daily returns over feed cost were Rs 119.40 and 146.73 for cows under T1 and T2, respectively, however, these differences were non significant. The returns over feed cost for cows fed bypass protein diet (T2) were 22.89 % higher than the cows fed control diet (T1). The overall result suggested that the feeding formaldehyde treated rapeseed meal to high producing lactating crossbred cows under field condition was found to be economically beneficial.
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ANIMAL NUTRITION, A STUDY