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Interrelationships among Water Quality, Climate and Diet on Feedlot Performance of Steer Calves^1,2,

University of Arizona, Tucson 85721

Abstract

Four experiments involving 16 pens of 8 to 10 crossbred steer calves each were conducted at Yuma, Arizona. Initial and final weights were approximately 170 and 275 kg, respectively. The experimental design was a 2 x 2 x 4 factorial replicated over 2 yr with main effects for season (summer, winter), diet (H = ground alfalfa hay, H + G = 50% ground alfalfa, 47.5% dry-rolled wheat and 2.5% molasses) and water source (N = normal, S = saline) during two consecutive 56-d periods in each experiment (N-N, N-S, S-N, S-S). Normal water contained approximately 1,300 ppm, and saline water contained approximately 6,000 ppm, total dissolved salts. Steers on the H + G diet gained 32% faster (P < .01) and consumed 4% less (P < .01) feed than those on the H diet. Gain and feed intake during winter were greater than during summer (20% and 7%, respectively, P < .01). Gain and feed intake were reduced approximately 9% (P < .01) on S water combinations compared with N-N water. Depression in gain and feed intake due to heat stress (summer season) or S water ingestion was greater on the H diet (diet x water source and diet x season interactions, P < .02). Although season x water source interactions were not significant, saline water ingestion tended to be more detrimental during periods of heat stress (summer). Apparent adaptation to saline water occurred on the H + G diet, but not on the H diet. Thus, energy density of the diet significantly influenced the response of feedlot steers to hot summer conditions and saline water ingestion.

¹ Journal Paper No. 4473 of the Arizona Agric. Exp. Sta., Tucson.

² Contribution to Western Reg. Res. Proj. W-173, Stress Factors of Farm Animals and their Effects on Performance.

³ Dept. of Anim. Sci.