| چکیده انگلیسی مقاله |
Introduction and Objective: The use of agricultural by -products instead of grain seeds in livestock diets has been an important issue for scientific study. One of these products is potato waste that, if properly processed by methods such as silo, can replace cereal seeds such as barley in the diet, due to the proper nutritional value of this product, improving animal growth performance, reducing feed costs, reducing feed costs and prevent food from being wasting. Therefore, the purpose of this study was to investigate the effect of replacing different levels of potato waste silage with barley on growth performance, digestibility, and rumen and blood parameters of fattening lambs.
Material and Methods: In this study, 30 Zell and Afshar mixed male lambs with an mean weight of 26±2 kg and an mean age of 5.5±0.4 months were used in a completely randomized design with 5 treatments and 6 replications for 90 days. The experimental treatments included the control treatment (without potato waste silage) and the treatments containing 25, 50, 75 and 100 potato waste silage replacement of barley seeds (based on dry matter).
Results: The results of performance traits showed that there was a significant difference in fattening weight, daily weight gain, dry matter intake and feed conversion ratio between experimental treatments (p<0.05). The highest and lowest final weight, daily weight gain and dry matter intake were observed in the treatment containing 50% of potato waste silage and the control treatment, respectively. The results of the apparent digestibility of nutrients of experimental diets showed that there was a significant difference in the apparent digestibility of raw protein and NDF between experimental treatments (p<0.05). The highest and lowest apparent digestibility of crude protein was observed in the treatment containing 50% of potato waste silage and the control treatment, respectively. The results of some blood serum parameters showed that there was a significant difference in the concentration of glucose, triglyceride, LDL and BUN between the experimental treatments (p<0.05). The results of rumen fermentation parameters showed that there was a significant difference in the population of lactic acid bacteria, coliforms, protozoa, rumen liquid ammonia nitrogen, total VFA, acetic acid, propionic acid, butyric acid, valeric acid and isovaleric acid between experimental treatments (p<0.05). . The highest population of lactic acid bacteria in the treatment containing 100% of potato silage waste, the lowest total form population in the treatment containing 75% of potato waste silage, the highest population of protozoa in the treatment containing 100% of potato silage waste and the highest concentration of total volatile fatty acids in the treatment containing 50% of potato waste was observed.
Conclusion: The overall results of the present study showed that growth performance, the appearance of crude protein digestion, the total concentration of rumen fluid fatty acids and the population of bacteria and protozoa improved by consuming 50 % of potato waste.
|