Effects of prenatal androgenization and lactation on adipose tissue metabolism in finishing single-calf heifers.
Twelve control (C) and 12 prenatally androgenized (PA) lactating (L) first-calf heifers and five (two C and three PA) similar, nonlactating (NL) heifers were used to assess the effects of PA and L on the metabolic activity of s.c. adipose tissue (AT). Heifers were fed an 85% concentrate diet, and their calves were weaned at 112 +/- 1 d of age. Adipose tissue was biopsied at approximately 77 d (period 1, during lactation for L heifers) and 126 d (period 2, after L heifers had calves weaned) postpartum. The NL heifers gained .22 kg/d faster (P = .20) and had greater fat deposition than L heifers during period 1. The PA heifers were fatter and gained 14.6% faster than C heifers during lactation. Epinephrine (E) and norepinephrine (NE) increased in vitro fatty acid (FA) release 25 (P < .01) and 15% (P < .06), respectively, above basal rates. Near-maximal release of FA, as estimated by stimulation with E plus theophylline plus adenosine deaminase (ETAD), was 73% (4,110 vs 2,379 +/- 161 nEq/[2 h.100 mg of tissue]; P < .01) above basal rates. Basal FA release was unaffected, but ETAD-stimulated rates were decreased (P < .04; 4,430 +/- 246 vs 3,789 +/- 209 nEq/[2 h.100 mg of tissue]) by PA. Stimulation of FA release by E (P = .22) or NE (P = .31) did not differ between C and PA. For NL heifers, PA decreased (P < .02) FA release, which corresponded with their greater fat deposition, but PA did not affect L heifers (PA x L interaction, P = .14). The content of NEFA in s.c. AT (pool size) was 34% greater (P < .01) during period 2 than during period 1. Pool size was not affected (P = .72) by NE but was increased by E (1,628 vs 1,777 +/- 92 nEq/100 mg of tissue; P < .05) and ETAD (1,628 vs 2,176 +/- 93 nEq/100 mg of tissue; P < .01). For L heifers, PA tended (P < .07) to increase incorporation of acetate into FA during period 1. Thus, PA resulted in subtle increases in lipogenesis and decreases in lipolysis during the first lactation-weaning cycle that were consistent with greater rates of gain and fat deposition.
Reiling
B A
BA
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Drackley
J K
JK
Grum
L R
LR
Berger
L L
LL
D000085:Acetates / Q000032:analysis / Q000378:metabolism; D000243:Adenosine Deaminase / Q000032:analysis / Q000378:metabolism; D000273:Adipose Tissue / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D000818:Animals; D001706:Biopsy / Q000662:veterinary; D002250:Carbon Radioisotopes; D002417:Cattle / Q000254:growth & development / Q000378:metabolism* / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D004343:Drug Implants; D004837:Epinephrine / Q000494:pharmacology; D005227:Fatty Acids / Q000032:analysis / Q000378:metabolism; D005230:Fatty Acids, Nonesterified / Q000032:analysis / Q000378:metabolism; D005260:Female; D005947:Glucose / Q000378:metabolism; D005990:Glycerol / Q000032:analysis / Q000378:metabolism; D007774:Lactation / Q000502:physiology*; D050356:Lipid Metabolism; D008055:Lipids / Q000032:analysis; D009638:Norepinephrine / Q000494:pharmacology; D011247:Pregnancy; D011297:Prenatal Exposure Delayed Effects; D013739:Testosterone / Q000008:administration & dosage / Q000494:pharmacology*; D013806:Theophylline / Q000494:pharmacology
D000085:Acetates; D002250:Carbon Radioisotopes; D004343:Drug Implants; D005227:Fatty Acids; D005230:Fatty Acids, Nonesterified; D008055:Lipids; D013739:Testosterone; D013806:Theophylline; D000243:Adenosine Deaminase; D005947:Glucose; D005990:Glycerol; D009638:Norepinephrine; D004837:Epinephrine