返青期和盛草期牧场放牧的高山美利奴种公羊营养盈亏监测

本研究通过对返青期和盛草期牧场放牧的高山美利奴种公羊进行营养监测,旨在掌握高山美利奴种公羊放牧地牧草营养物质的季节变化规律以及高山美利奴种公羊营养的盈缺,为其科学饲养提供理论依据.选择6只成年、健康、体重[(104.94±5.15)kg]相近的高山美利奴种公羊作为试验动物,采用粪袋全收粪和盐酸不溶灰分(AIA)结合法测...

Nutritional Surplus or Deficiency Monitoring of Grazing Alpine Merino Breeding Rams in Regreening Stage and Growing Stage Pasture

This study was conducted to monitor the nutrient of grazing Alpine Merino breeding rams in regreening stage and growing stage pasture,to master the seasonal variation of forage nutrients in grazing land of Alpine Merino breeding rams and nutritional surplus or deficiency of Alpine Merino breeding rams,and to provide a theoretical basis for its scientific feeding.Six adult healthy Alpine Merino breeding rams with similar body weight of(104.94±5.15)kg were selected as experimental animals,the combination method of full collection of excrement bag and insoluble ash in hydrochloric acid was used to determine the intake of rams in regreening stage and growing stage pasture,the simulated feeding method was used to collect forage,and investigate the vegetation.The results showed as follows:1)the dominance index,diversity index,evenness index and aboveground biomass of forage in growing stage were significantly higher than those in regreening stage(P<0.05).2)The organic matter content of forage in regreening stage was significantly higher than that in growing stage(P<0.05),and the contents of ash and crude protein of forage in growing stage were significantly higher than those in regreening stage(P<0.05).3)The metabolic energy intake and crude protein intake of Alpine Merino breeding rams in growing stage were significantly higher than those in regreening stage(P<0.05),and the crude protein digestibility,neutral detergent fiber digestibility and acid detergent fiber digestibility of Alpine Merino breeding rams in regreening stage were significantly higher than those in growing stage(P<0.05).4)The rumen pH of Alpine Merino breeding rams in regreening stage was significantly higher than that in growing stage(P<0.05),and the proportions of butyric acid,isobutyric acid and isovaleric acid of Alpine Merino breeding rams in growing stage were significantly higher than those in regreening stage(P<0.05).In summary,the productivity and nutritional quality of forage in growing stage are superior to those in regreening stage.The nitrogen utilization efficiency of rumen microorganisms of Alpine Merino breeding rams in regreening stage and growing stage are high,but the rumen fermentation efficiency is reduced due to the lower nutrient quality of forage in regreening stage.The metabolizable energy intake and crude protein intake of Alpine Merino breeding rams is seriously insufficient in regreening stage and growing stage.Therefore,a certain amount of energy and protein feed should be supplemened to Alpine Merino breeding rams in regreening stage and growing stage.