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Effects Of Different Grassland Type On Meat Performance And Quality Of Grazing Sheep

Posted on:2010-07-01Degree:DoctorType:Dissertation
Country:ChinaCandidate:G M YinFull Text:PDF
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Based on grazing ecosystem in the high plain grassland and sand grassland of the Inner Mongolian steppe, plant population character was observed and plant nutrient composition and soil physical and chemical character were analyzed in the different sites from May to October in 2008.Thirty the cross sheep, thirty Mongolian sheep and thirty introducing sheep were used to compare all kinds of behaviors by whole observation, and to compare feed intake and selective intake by collecting excrement in August and September.Four months and six months sheep were slaughtered for measurement of the performance of producing meat and edible quality of the cross sheep, Mongolian sheep and introducing sheep in August and October, and to compare the different grazing sheep and different environment in order to determining optimal grazing sheep in different Grassland Type.The nutritive compositions of grazing sheep meat, community character and nutritive status of community, and physical and chemical character of soil were investigated by the analysis and measurement of grazing behavior, the performance of producing meat, and edible quality under the different vegetation based on the grazing ecosystem in the sand and high plain grassland. The main results were shown as follows:1. The height, cover, above present biomass, richness, edible forages, and diversity of the community in grazing plot of the sand grassland were lower than that of the high plain grassland. The contents of ash and crude protein were lower, whereas crude fat, crude fiber and Ca were higher in the sand grazing plot compared with the high plain grazing plot.2. The feeding time rate of grazing sheep in the sand grassland were less than that in the high plain grassland. The feeding time of the Mongolian sheep were more than the introducing sheep and cross sheep grazed in the sand grassland. The feeding time rate of different breeds grazing at the high plain grassland was no different.3. The feed intake of Mongolia, introducing and cross sheep were 1.15kg/d,1.60 kg/d and 1.35kg/d in the sand grassland, which were 1.56kg/d,1.82kg/d and 1.71 kg/d in the high plain grassland,difference value were 0.41 kg/d,0.22kg/d and 0.36 kg/d, respectively.4. The amount index of meat quality and body size of cross sheep and introduced sheep in the high plain grassland was lower than in the sand grassland, difference value of body size was 5cm,difference value of slaughter rate was 1.5% .Mongolian sheep have no difference in sites. 5. The meat nutrition of Mongolia sheep grazing in the sand grassland presented high values, which was high in the contents of protein, Fe, Zn, and amino acid. The meat nutrition of the cross sheep grazing at the high plain grassland presented high values, which was high Fe, Zn and amino acid, There was high the contents of protein, Ca and P in the meat of the Mongolia sheep.6. The content of ash, protein, fatty, Ca and P of grazing sheep has correlation coefficient with the contents of feeding grass nutrition. There are different in convert of different nutrition in different grazing ecosystem.
Keywords/Search Tags:The high plain grassland, The sand grassland, Grazing behavior, The feed intake, Meat performance, Mutton nutrition values
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