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Sixty single-reared lambs sired by Hampshire rams were used to study the effects of monensin and ryegrass straw on feedlot performance. Two levels of monensin (0 and 27.5 ppm) and two levels of ryegrass straw (0 and 25%) were arranged in a 2 × 2 factorial treatment arrangement. Each of the four pelleted diets was fed ad libitum to 15 lambs. Monensin-fed lambs had lower (P 0.10), monensin-fed lambs also had improved feed efficiencies over lambs not fed monensin. Crude protein, ether extract and crude fiber digestibilities of the diets were increased by the addition of monensin. Lambs fed ryegrass straw had lower (P

The response of growing pigs receiving a low energy diet (LE ration) to periodic exposures to a high energy diet (HE ration) was studied. Forty-eight Berkshire × Yorkshire barrows of approximately 23 kg body weight were divided into six equal groups receiving one of the following treatments: HE control, LE control, and alternations between the LE and HE rations in cycles of 5 days LE: 1 day HE. 4 days LE: 1 day HE, 3 days LE: 1 day HE, and 2 days LE: 1 day HE. The average daily gain of the HE control was significantly greater (P