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Incidence of Ketosis, other Diseases, and Some Postpartum Reproductive Ailments in Normal and Triiodothyronine-Treated Cows ¹

Department of Dairying, Michigan State University, East Lansing

ABSTRACT

The incidence of ketosis in 1,032 cows calving between November and December was 19%. Triiodothyronine (T₃) implants increased either the severity or incidence of ketosis symptoms. This might have been due to increasing the relative caloric deficiency. More than two-thirds of the cows displaying clinical symptoms of ketosis did not have other diseases or elevated temperatures. Uterine involution was more rapid in ketotic cows and in T₃-implanted cows than in controls. Regression of pregnancy corpora lutea was more rapid in the T₃-implanted cows. The calving interval was seven days shorter for thyronine-implanted cows. Milk production was 11% greater for ketotic cows than for nonketotic cows, with thyronine causing a slight depression in the second month of lactation.

¹ Journal Article No. 3412 from the Michigan Agricultural Experiment Station. This study was partially supported by Smith, Kline and French Laboratories, Philadelphia. A preliminary report of this data appeared in J. Animal Sci., 21: 1021. 1962.

² Present address: The Squibb Institute for Medical Research, New Brunswick, New Jersey.