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Protein Fractions of Tifton 85 and Rye-Ryegrass Due to Sward Management Practices

^a Agronomy Dep., Ona Range Cattle Research and Education Center, Ona, FL 33865
^b Dep. of Animal Sci., Ona Range Cattle Research and Education Center, Ona, FL 33865
^c Agronomy Dep., Univ. of Florida, Gainesville, FL 32611-0300
^d Dep. of Animal Sci., Univ. of Florida, Gainesville, FL 32611
^e Dep. de Zootecnia/UFRPE, Av. Dom Manoel de Medeiros, S/N, Dois Irmaos, 52171-900, Recife-PE, Brazil
^f Alltech, Lexington, KY 40546-0215. This research was sponsored in part by a USDA-CSREES Tropical and Subtropical Agricultural Research Program Grant

View larger version (20K): [in this window] [in a new window]   Fig. 1. Nitrogen fertilization effects on crude protein (CP) fraction concentrations in total CP of rye–ryegrass herbage. There was a linear increase in Fraction A (P < 0.01, SE = 28), and a linear decrease in Fraction B (P < 0.01, SE = 23) and Fraction C (P < 0.05, SE = 12) as N fertilization level increased.

View larger version (14K): [in this window] [in a new window]   Fig. 2. Effects of N fertilization on crude protein (CP) disappearance of rye–ryegrass herbage. Means indicated with * were different (P < 0.05, SE = 26) within hours.

View larger version (33K): [in this window] [in a new window]   Fig. 3. (A) Nitrogen fertilization and (B) regrowth interval effects on crude protein (CP) fraction concentrations in total CP of Tifton 85 herbage. There was no effect of N fertilization on Fraction A (P > 0.10, SE = 23), a linear increase (P < 0.05, SEM = 30) in Fraction B, and a linear decrease (P < 0.01, SE = 11) in Fraction C. There was no effect of regrowth interval on Fractions A and B. Fraction C was different (P < 0.05) between intervals.

View larger version (21K): [in this window] [in a new window]   Fig. 4. Effects of N fertilization (A) and regrowth interval (B) on crude protein (CP) disappearance of Tifton 85 herbage. Means indicated with * were different (P < 0.05, SE = 34) within hours.