Assessing sensory capacity of animals using operant technology.

Operant technology is often employed in farm management (e.g., waterers in which an animal pushes a valve with its nose or snout [response] to receive water [reinforcement]).

The influence of sometribove dose and days in lactation on behavior of cows implanted with pelleted sometribove.

Data were from observations of behavior of 99 lactating Holstein cows during implantations with bST. Implantations were at 14-d intervals during 1 yr. Cows on one study received 0, 120, 240, or 360 mg; cows on a second study received 0, 160, or 320 mg of bST per implantation.

Effects of concentrated separator dried beet pulp on nutrient digestibility, milk production, and preference of Holstein cattle.

Concentrated separator by-product was fed to cattle to determine TDN, milk production, and feed preference. The TDN content of concentrated separator by-product was determined using a substitution method involving a basal diet of alfalfa and grass hay and a treatment diet of alfalfa and grass hay plus 10% added concentrated separator by-product. Four ruminally cannulated cows in a replicated 2 x 2 Latin square design were used.

Effects of isolation of calves on growth, behavior, and first lactation milk yield of Holstein cows.

Holstein (n = 323) calves in the herds of four experiment stations were reared individually (control) or in isolation to 70 d of age to determine whether isolation affected growth, behavior, and first lactation yield. Treatment differences were not observed for average daily gain for BW at d 28, 56 or 70. Postweaning approach distance was measured in two herds (n = 122; n = 28).

Effect of poultry waste feeding on intake, body weight and milk yield of Holstein cows.

Forty lactating Holstein cows were fed 0, 5.9, 11.7, or 17.