Livestock Research for Rural Development
نویسنده
چکیده
On-farm trials were carried out in two data collection periods to evaluate the performance of growing-fattening pigs fed on local sources of carbohydrates supplemented with 200 g/day of protein from soya bean grain or meal, in both cases enriched with vitamins and minerals. In the first period, four farmers with a total of 33 pigs using the traditional system based on concentrates provided base line data. In addition, the use of sugar cane juice (SCJ) and soya bean cooked grains on a single farm including 29 animals was evaluated. The growth rate was calculated by linear regression from data of the live weight of the animals , which was recorded every 14 days, and used as a response variable in a model that included the effect of the farm as a variation factor. This effect was found to be significant (P<0.05). The means for daily gain (g/day) on the farms using the traditional system based on commercial concentrates ranged from 527 up to 623 g/day, while on the farm with SCJ daily gain was 427 g/day. In the second period a revolving research fund was established and the experimental diets evaluated were based on sources of carbohydrates available on each farm and the use of 500 g of a protein supplement (40% protein) from soya bean meal. In this period, growth rate of the animals was calculated as described above and the effect of farm and diet were included as variation factors in the variance analysis. Both factors were found to be significant (P<0.05) for daily gain. The adjusted means for daily gain on the different diets were: commercial concentrate (baseline data, 20 animals in 4 farms) 567 g/day; SCJ (24 animals in 2 farms) 518 g/day; plantain and bananas (8 animals in a single farm) 367 g/day, and for farm and kitchen wastes and residues (24 animals in 4 farms) 512 g/day. It was concluded that protein is the main limiting factor and it was recommended that work in this area be given the highest priority. The fact that the farmers were willing to repay 8.5 % above the value of the inputs borrowed indicates their willingness to participate in further research, and the constructive role that a revolving research fund can play to facilitate on-farm livestock research.
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تاریخ انتشار 2007