Variations in serum levels of insulin-like growth factor-1, growth hormone and thyroid hormones during lactation in dairy cows.
1. Serum levels of insulin-like growth factor-1 (IGF-1) in dairy cows declined after parturition, remained low during the period of early lactation with peak milk production and rose gradually until the end of lactation thereafter. 2. Growth hormone (GH) levels in sera of cows changed in parallel with milk yields. 3. Serum thyroxine and triiodothyronine levels during lactation remained fairly constant.
Faculty of Bioresources, Mie University, Tsu, Japan.
S
S
Hoshino
M
M
Wakita
Y
Y
Kobayashi
R
R
Sakauchi
Y
Y
Nishiguchi
A
A
Ozawa
K
K
Hodate
I
I
Hamaguchi
Y
Y
Yotani
D000818:Animals; D002417:Cattle; D005260:Female; D013006:Growth Hormone / Q000097:blood*; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D007774:Lactation / Q000097:blood*; D013963:Thyroid Hormones / Q000097:blood*; D013974:Thyroxine / Q000097:blood; D013997:Time Factors; D014284:Triiodothyronine / Q000097:blood
D013963:Thyroid Hormones; D014284:Triiodothyronine; D007334:Insulin-Like Growth Factor I; D013006:Growth Hormone; D013974:Thyroxine