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Nitrogen Fertilization and Stocking Rate Affect Stargrass Pasture and Cattle Performance

A. Hernández Garaya, L. E. Sollenbergerb,*, D. C. McDonaldc, G. J. Ruegseggerd, R. S. Kalmbachere and P. Mislevye

a Colegio de Postgraduados, Montecillo, Texcoco, Edo de México, Mexico CP56230
b P.O. Box 110300, Univ. of Florida, Gainesville, FL 32611-0300
c Bodles Res. Stn., Old Harbour P.O., Jamaica
d Dairy Nutrition Services, Chandler, AZ 85210
e Range Cattle Res. and Educ. Center, Ona, FL 33865



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  		Fig. 1. Weanling bull average daily gain (ADG) response to average pregraze herbage mass on stargrass pastures.

 


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  		Fig. 2. Weanling bull average daily gain (ADG) response to average herbage allowance on stargrass pastures.

 


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  		Fig. 3. Weanling bull liveweight gain per hectare response to stocking rate (SR) on stargrass pastures fertilized at three rates of N. For N rates of 112, 224, and 336 kg N ha–1, respectively, fitted curves for Year 1 are Y = –78 + 305 SR – 30.8 SR2; Y = –462 + 499 SR – 49 SR2; and Y = –160 + 359 SR – 33.5 SR2. For N rates of 112, 224, and 336 kg N ha–1, respectively, fitted curves for Year 2 are Y = –26 + 242 SR – 20.8 SR2; Y = –488 + 501 SR – 46.7 SR2; and Y = –158 + 283 SR – 19 SR2.

 




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