GnRH-induced LH secretion in prepubertal female fat-tailed lambs fed with tannin-rich oak leaves (Quercus hartwissiana)

Kaya M., Cenesiz M., Onder F., Ucar O., Uzun M., Yildiz S.

REVUE DE MEDECINE VETERINAIRE, cilt.157, sa.7, ss.387-390, 2006 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 157 Sayı: 7
  • Basım Tarihi: 2006
  • Dergi Adı: REVUE DE MEDECINE VETERINAIRE
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.387-390
  • Anahtar Kelimeler: tannins, oak leaves, lambs, GnRH, LH, LUTEINIZING-HORMONE, REPRODUCTIVE EFFICIENCY, POLYETHYLENE-GLYCOL, LOTUS-CORNICULATUS, CONDENSED TANNINS, EWES, ESTRADIOL, SYSTEMS, SURGE, SHEEP
  • Akdeniz Üniversitesi Adresli: Hayır

Özet

To test the effect of tannins on GnRH-induced LH secretion, prepubertal female Tuj lambs were fed with varying amounts of tannin-rich oak leaves (Quercus hartwissiana) and polyethylene glycol (PEG 6000, as a tannin binding agent) for two months. A total of 42 lambs were assigned into the 7 following groups (n = 6 per group): 1) control group (645 g hay with no leaf no PEG); 2) 185 g leaf + 0 % PEG group; 3) 185 g leaf + 5 % PEG group; 4) 185 g leaf + 10 % PEG group; 5) 370 g leaf + 0 % PEG group; 6) 370 g leaf + 5 % PEG group; 7) 370 g leaf + 10 % PEG group. All groups were given 272 g concentrate and varying amounts of hay such that the amount of roughage was equal to 645g. On day 56, the lambs were body condition scored and, GnRH agonist (Ovarelin, 6 pg/lamb) was injected into jugular vein of all lambs (0 h), and blood samples were collected at 30 min intervals from -30 to 300 min for the determination of LH levels. Basal level, duration of secretion, peak level, timing of peak of LH secretion and total area under curve (AUC) did not differ among groups (p > 0.05). However, significant correlations were observed between body condition score (BCS) and peak value of LH (p = 0.002) and AUC (p = 0.016).