The effects of altered photoperiod and of sound stimulation on feeding and other behaviors of dairy cattle and sheep Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/2801pm105

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  • I. The Effect of Artificial Photoperiod on Eating Behavior and Other Behavioral Observations of Dairy Cows. Twenty-eight cows were randomly assigned to a dairy photoperiod of 18 h light and 6 h darkness or to continuous light and observed 1 d each month from December 1981 to February 19.82. Lighting regimen did not affect eating behavior or milk production. Overall means of total eating time, number of eating bouts and average time eating per bout on the three observation days were 270 to 280 min, 10 to 12 times and 24 to 27 min, respectively. Eating behavior and milk production were not significantly correlated. Eating patterns were similar in both groups and across observation days. Peaks of eating activity occurred before sunset, bracketing the evening milking and after the offering of fresh feed in the morning. Approximately 80% of total eating activity occurred between 0900 and 2100 h in both groups. Cows had a clear preference for entry into the right or left side of the milking parlor, and entry order was repeatable. Milking order and milk production were not correlated. In one group, location of free stalls did not influence utilization; but in the other group, centrally located stalls were utilized more than stalls at either end of the alley. About 40% of cows had individual free stall preferences. II. The Effect of Recorded Sound on Feeding Behavior of Lambs. This study was designed to examine the effect of recorded sound on the feeding behavior and feed intake of lambs and to examine their feeding patterns throughout the day. Thirty crossbred lambs were randomly assigned to 6 pens. The trial lasted 44 d (July 30 to September 11, 1982) and consisted of 4 d acclimation to test facilities, then 4 d with no sound stimulation followed by 4 d with sound stimulation, This cycle of 4 d without sound followed by 4 d with sound stimulation was repeated for the remainder of the trial . Sound stimulation consisted of 6 min broadcasts, every 3 h, of sounds associated with feed delivery and eating. Lambs were observed continuously for 24 h on 6 observation days, 3 when lambs were subjected to sound stimulation and 3 when they were not. The sound stimulation affected neither feed intake nor feeding behavior. Lambs largely ignored the recorded sounds, and total feed intakes during 20 sound-stimulated vs 20 non-sound-stimulated days were 1234 kg vs 1240 kg, respectively. There was a rhythmic feeding pattern at 1 to 2 h intervals, synchronously throughout the barn, and this was not affected by the 3 h cycle of sound stimulation. There were no major peaks in feeding activity except after the offering of fresh feed in the morning. Feeding activity did not change with sunrise or sunset and peaks of eating activity were evenly distributed throughout the 24 h. The overall means per lamb for the total time spent eating, the number of eating bouts, the average time eating per bout and the number of drinking episodes across the 6 observation d were 118.8 min, 22.6 times, 5.5 min, and 9.5 times, respectively.
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