Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban

Translated title of the contribution: Melatonin-based induction of ovarian cyclicity in intensive dairy Awassi flocks

Faigl Vera, Keresztes Mónika, Árnyasi Mariann, M. Kulcsár, Balogh Orsolya, Nagy Sándor, O. Szenci, S. Cseh, G. Huszenicza

Research output: Contribution to journalArticle

Abstract

The authors compared the efficacy of three different cycle induction/synchronisation protocols used out of the breeding season in dairy Awassi ewes. In Experiment 1 (Exp.1) 85 autumn-lambing dams were used. Proportion of out-of-season cycling animals was determined by assaying milk progesterone (P4) or faecal gestagen metabolites 3 times 7 days apart on dO, d7, d13 (Exp.1 d0:10th February). The Gest group was treated in April with gestagen sponge (d56-d70) + 600IU eCG (d70). The Mel+Gest group received a melatonin implant (Melovin18, CEVA, Libourne, France) on dO and was synchronised as the Gest group 56 days later. The Mel+GPG animals were treated with melatonin (dO) and synchronised with GnRH (d63) - PGF2a (d70) - GnRH (d72). Ewes were inseminated twice (fixed-time Al) and were introduced to rams 14 days later. Individual P4 profiles were followed from d45 to d99. Pregnancy associated glycoprotein was assayed on d99 and d133. Date of conception was determined according to lambing dates. IGF-I and thyroxin levels were determined from all samples collected from day 46 until 28 days post Al. In Exp.2 the protocol was repeated with 115 spring-lambing dams (Exp.2 d0:22 June). The authors conclude that reproductive activity of Awassi sheep is seasonal under temperate latitude. Slow-release melatonin implant inserted in February could not induce cyclic ovarian function; however, the same treatment had beneficial effects when used in June. We found that melatonin treatment had a negative influence on plasma IGF-I levels which, in turn, may impair milk production in lactating dams. The GPG protocol is a possible alternative of the long-term gestagen treatment for cycle synchronisation and Al, but it is only effective when used near the natural breeding season.

Original languageHungarian
Pages (from-to)24-29
Number of pages6
JournalMagyar Allatorvosok Lapja
Volume134
Issue number1
Publication statusPublished - Jan 2012

Fingerprint

Awassi
melatonin
Periodicity
Melatonin
periodicity
progestational hormones
dairies
flocks
lambing
Progestins
insulin-like growth factor I
Insulin-Like Growth Factor I
Gonadotropin-Releasing Hormone
Breeding
ewes
breeding season
Milk
Porifera
thyroxine
Thyroxine

ASJC Scopus subject areas

  • veterinary(all)

Cite this

Vera, F., Mónika, K., Mariann, Á., Kulcsár, M., Orsolya, B., Sándor, N., ... Huszenicza, G. (2012). Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban. Magyar Allatorvosok Lapja, 134(1), 24-29.

Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban. / Vera, Faigl; Mónika, Keresztes; Mariann, Árnyasi; Kulcsár, M.; Orsolya, Balogh; Sándor, Nagy; Szenci, O.; Cseh, S.; Huszenicza, G.

In: Magyar Allatorvosok Lapja, Vol. 134, No. 1, 01.2012, p. 24-29.

Research output: Contribution to journalArticle

Vera, F, Mónika, K, Mariann, Á, Kulcsár, M, Orsolya, B, Sándor, N, Szenci, O, Cseh, S & Huszenicza, G 2012, 'Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban', Magyar Allatorvosok Lapja, vol. 134, no. 1, pp. 24-29.
Vera F, Mónika K, Mariann Á, Kulcsár M, Orsolya B, Sándor N et al. Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban. Magyar Allatorvosok Lapja. 2012 Jan;134(1):24-29.
Vera, Faigl ; Mónika, Keresztes ; Mariann, Árnyasi ; Kulcsár, M. ; Orsolya, Balogh ; Sándor, Nagy ; Szenci, O. ; Cseh, S. ; Huszenicza, G. / Melatonin alapú ciklusindukciós technikák tejelõ awassi juhokban. In: Magyar Allatorvosok Lapja. 2012 ; Vol. 134, No. 1. pp. 24-29.
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