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Protein Protected Fat for Ruminants: III. Digestion and Performance of Lambs^{1 ,2,}

The University of Arizona, Tucson 85721

Abstract

A digestion and performance trial was conducted with 14 lambs fed a 60% concentrate diet to determine the digestibility and utilization of a formaldehyde treated casein cottonseed oil emulsion (PCO). The control diet containing no added oil was fed to four lambs and four lambs were fed a similar diet containing 8% cottonseed oil (CO). Six lambs were initially fed 8% PCO and three of these lambs were raised to a 12% PCO diet after 30 days on trial.

Lipid digestibility and total digestible nutrients were greater (P<.05) for all treatments containing cottonseed oil compared to the control treatment. Dry matter and gross energy digestibilities were higher for the cottonseed oil treatments compared to the control; however, the difference was not significant (P>.05). Cottonseed oil digestibility calculated by difference was similar among the cottonseed oil treatments, averaging 93.2%.

Fecal soaps calculated as a percentage of the ingested lipid and the total percentage of unsaturated fatty acids in the feces were highest (P<.05) for the control treatment compared to the three other diets.

Considering both periods (1 to 30 days and 31 to 70 days) daily feed intake was the highest for the control lambs (1.50 kg/day) and lowest for the 8% CO treatment (1.18 kg/day) with the 8% PCO lambs at an intermediate level (1.35 kg/day). Digestible energy intake (kcal/day/W^.75_kg) was higher for the 8% PCO treatment when compared to the control and 8% CO treatments, and digestible energy intake was not increased by feeding a 12% level of PCO.

¹ Arizona Agricultural Experiment Station Technical Paper 2718.

² This study was supported in part by a grant from Fats and Protein Research Foundation, Inc., Des Plaines, IL.