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Paper-Lecture39 - Cottonseed Meal or Feather Meal...

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1666 1 Florida Agric. Exp. Sta. Journal series no. R-05378. 2 To whom correspondence should be addressed: 3401 Experiment Station. Received April 26, 1996. Accepted February 11, 1997. Cottonseed Meal or Feather Meal Supplementation of Ammoniated Tropical Grass Hay for Yearling Cattle 1 W. F. Brown 2 and F. M. Pate Range Cattle Research and Education Center, University of Florida, Ona 33865 ABSTRACT: Despite high N intake by cattle consuming ammoniated forages, improvements in ADG might be expected by feeding proteins that supply ruminally available and(or) undegraded in- take protein. Growth studies with 220-kg steers were conducted to evaluate ammoniated hay plus a liquid cane molasses-based supplement containing urea or a combination of urea and .07, .14, or .21 kg of CP daily from cottonseed meal (CSM) or feather meal (FM). Steers grazed dormant pasture and were fed hay plus 1.36 kg of DM daily per steer of the supplement. In each of 3 yr, total DM intake was similar ( P > .60) among treatments, averaging 3.0% of BW. Daily gain by steers supplemented with urea and maximum ADG were similar across years, ranging from .21 to .23 kg and .50 to .60 kg, respectively. In all years for CSM supplementation, and in two of the three years for FM supplementation, increasing level of CP supplementa- tion resulted in linear ( P < .01) increases in ADG and gain:feed ratio (GF), with no differences ( P > .10) between the protein sources. In one year, ADG and GF by steers supplemented with FM were maximized at the .07 kg of CP level, suggesting greater efficiency of protein utilization in FM. Improved performance by cattle fed ammoniated tropical grass hay may be obtained by feeding a protein supplement that pro- vides preformed protein that is either moderately or highly resistant to ruminal degradation. Ruminal degradation characteristics of protein sources may influence efficiency of protein utilization in cattle fed ammoniated tropical grass hay plus molasses-based supplements. Key Words: Ammoniated Feeds, Forage, Supplements, Protein Utilization, Cottonseed, Oilmeal, Feather Meal J. Anim. Sci. 1997. 75:1666–1673 Introduction During the late fall and winter, minimal pasture production and low nutritive value limit cattle perfor- mance. Anhydrous ammonia-treated forage may pro- vide a basal diet to which supplementation programs may be applied to achieve desired levels of animal production (Fike et al., 1995). Even though N concentration of ammoniated forages may exceed cattle requirements for CP (NRC, 1996), improved performance was observed when ammoniated forages were supplemented with plant or animal proteins (Zorrilla-Rios et al., 1991; Beck et al., 1992). When dietary ruminally degraded protein was adequate, feeding proteins such as hydrolyzed feather meal ( FM ) that were highly resistant to ruminal degradation resulted in greater efficiency of protein utilization than feeding soybean meal, which was moderately resistant to ruminal degradation (Stock et al., 1981; Gibb et al., 1992). In other cases, responses to slowly and moderately ruminally degraded proteins were related to CP concentration rather than to concentration of ruminal escape protein (Veira et al.,
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