[Dynamics of changes in thyroxine levels in castrated newborn calves].
Changes in thyroxin levels were studied in calves castrated just after birth. The changes in thyroxin concentration in the blood serum were studied until the eighth day of life of the calves and the weight gains were monitored until weaning at an age of 90 days. In the experimental group, lower thyroxin levels were first recorded in the third hour post natum and were observed to persist until the eighth day; except for three hours the decrease was not statistically significant. Neither were any significant differences observed in the average daily gains in both groups of calves. Treatments like non-surgical castration in newborn calves do not elicit extreme stress reactions that would be conducive to disorders of health and vitality.
Puzder
P
P
Experimental Research Centre, Veterinary University, Zemplínska Teplica.
Elbertová
A
A
Kusnír
J
J
Zeltvay
T
T
D000818:Animals; D000831:Animals, Newborn / Q000097:blood*; D002369:Castration / Q000662:veterinary*; D002417:Cattle / Q000097:blood*; D013974:Thyroxine / Q000097:blood*
D013974:Thyroxine
Dynamika zmien tyroxínu u kastrovaných novonarodených býckov.