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Titolo:
Increased plasma follicle-stimulating hormone concentrations in prepubertal gilts from lines selected for increased number of corpora lutea
Autore:
Ford, JJ; Zimmerman, DR; Wise, TH; Leymaster, KA; Christenson, RK;
Indirizzi:
USDA ARS, Roman L Hruska US Meat Anim Res Ctr, Clay Ctr, NE 68933 USA USDAARS Clay Ctr NE USA 68933 Meat Anim Res Ctr, Clay Ctr, NE 68933 USA Univ Nebraska, Dept Anim Sci, Lincoln, NE 68583 USA Univ Nebraska LincolnNE USA 68583 , Dept Anim Sci, Lincoln, NE 68583 USA
Titolo Testata:
JOURNAL OF ANIMAL SCIENCE
fascicolo: 7, volume: 79, anno: 2001,
pagine: 1877 - 1882
SICI:
0021-8812(200107)79:7<1877:IPFHCI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
PORCINE GRANULOSA-CELLS; LUTEINIZING-HORMONE; OVULATION RATE; LITTER SIZE; PERIOVULATORY PERIOD; METABOLIC-CLEARANCE; SEXUAL DEVELOPMENT; FSH; GROWTH; PUBERTY;
Keywords:
FSH; ovulation; selection; ovarian development;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
40
Recensione:
Indirizzi per estratti:
Indirizzo: Ford, JJ USDA ARS, Roman L Hruska US Meat Anim Res Ctr, POB 166,State Spur18D, Clay Ctr, NE 68933 USA USDA ARS POB 166,State Spur 18D Clay Ctr NE USA 68933 E 68933 USA
Citazione:
J.J. Ford et al., "Increased plasma follicle-stimulating hormone concentrations in prepubertal gilts from lines selected for increased number of corpora lutea", J ANIM SCI, 79(7), 2001, pp. 1877-1882

Abstract

Plasma follicle-stimulating hormone (FSH) was evaluated in gilts from two studies in which ovulation rate was increased through direct selection for number of corpora lutea (CL) to determine whether selection for ovulation rate affected FSH secretion during prepubertal development. In the first study, 76 control and 110 selected gilts of University of Nebraska gene pool lines were bled twice during prepubertal development. Plasma FSH concentrations were greater (P < 0.05) at 53 (13.5%) and 75 (21.3%) d of age in selected than in control gilts. In the second study, 254 control gilts, 261 giltsfrom a line selected for ovulation rate, and 256 gilts from a line selected for uterine capacity were bled at three prepubertal ages. Plasma FSH was greater (P < 0.05), relative to controls, on d 34 (> 24%), 55 (> 13%), and 85 (> 10%) in White Composite gilts selected for either increased ovulationrate or for greater uterine capacity. Unilateral ovariectomy and hysterectomy were performed at 160 d of age on random gilts in these three lines (n = 377); weights of these organs were evaluated to determine whether selection affected their development. Ovarian and uterine weights were less (P < 0.01) in the control than in the ovulation rate line. Subsequently, ovulation rate was determined during pregnancy (n <greater than or equal to> 130 gilts/line). Controls had fewer (P < 0.01) CL (14.6) than gilts of the ovulation rate line (17.7) but numbers similar (P <greater than> 0.10) to those of gilts of the uterine capacity line (14.7). Within each line, plasma FSH only on d 85 correlated positively with subsequent ovulation rate (P < 0.03,0.001, and 0.08; r = 0.17, 0.30, and 0.15 for control, ovulation rate, anduterine capacity lines, respectively). Ovarian weight at 160 d of age alsocorrelated with subsequent ovulation rate (P < 0.03 and 0.001; r = 0.23 and 0.38) in control and ovulation rate gilts but not in uterine capacity gilts (P > 0.10; r = 0.11). Gilts selected for increased number of CL, in two independent studies, had greater concentrations of FSH during prepubertal development than respective controls. The modest but significant, positive association of FSH at 85 d of age with subsequent ovulation rate provides additional support for using plasma FSH in prepubertal gilts to indirectly select for ovulation rate.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/09/20 alle ore 05:32:14