The aim of this study was the evaluation of the relationship between values of selected biochemical blood parameters at the moment of cloprostenol (PGF2α) administration and the effectiveness of oestrus induction and fertility indices in dairy cows. Examinations were conducted on 121 cows with the corpus luteum between 45 and 120 d post calving. These animals were injected with 500 μg/cow of PG...

The aim of this study was the effect pre-synchronization blood BHBA level on pregnancy rates sheep in non-breeding season. For purpose, 100 Merino/Merino crossbred ewe, aged 2-4 years, who have given one birth before, were used study. synchronization purposes, progesterone containing sponges 60 mg Medroxyprogesteron acetate (MPA) analogue, administered intravaginally for 14 days. (betahydroxybu...

Peripheral blood samples were collected throughout pregnancy from 11 red deer hinds. During the same period, 6 other hinds which mated but failed to produce calves were also sampled. Pretreatment of some of these hinds included synchronization of oestrus alone (N = 3) or with injection of 1000 i.u. PMSG (N = 9). During early and mid-pregnancy, LH and prolactin were frequently undetectable. Prol...

Bitches exhibited a characteristic arborization pattern of the fluid from the anterior vagina during pro-oestrus and oestrus. These changes were monitored together with conventional vaginal cytology and plasma oestrogen and progestagen concentrations. A classical ferning pattern, similar to that seen in bovine cervical mucus at oestrus, occurred after the peak in plasma oestrogen concentrations...

A total of 2567 indigenous Greek ewes (Chios, Vlachiki and VlachikixChios breeds) were used to determine the optimum time for insemination, following synchronization of oestrus with MAP-impregnated intravaginal sponges and PMSG during non-breeding season. Within each breed group, the ewes were divided into three subgroups and submitted to a double blind cervical artificial insemination 48 and 6...

If preconditioned by a period of isolation from rams during the non-breeding season, ewes of many breeds respond to the reintroduction of rams (teasing) by displaying a relatively synchronised oestrus, approximately one oestrous cycle later (Merino: Schinckel 1954a; Awassi: Eyal 1958; Romney: Edgar and Bilkey 1963; Merinos d'Arles: Prud'hon et al. 1966). The oestrous activity of the flock is sp...

The aim of present study was to study the effect of post-ovulatory insemination on the subsequent embryonic loss, oestrous cycle length and vaginal discharge in sows. Ten Large White multiparous sows were divided into two groups. Group A sows were inseminated once at 15 h after ovulation. Thereafter, they were ovariohysterectomized on day 11 (n = 5, first day of standing oestrus = day 1) and fl...

A study of the duration oestrus and estrous cycles in mares from Haflinger breed (HB) influence some factors was conducted. The records used for this were breeding registers State Stud farm Kabiuk near Shumen, covering a period 11 years (2009 to 2020). In included 15 with 110 estruses 22 cycles. With breed, average is 5.52 ± 0.26 days length cycle 24.21 1.13 days. year (P<0.001), month season (...

This study investigated the hypothesis that a reduction in submission rates at a resynchronised oestrus is not due to the resynchrony treatment involving intravaginal progesterone releasing devices (IVDs) and oestradiol benzoate (ODB) but is associated with artificial insemination (AI) at the first synchronised oestrus. In Experiment 1, cows were synchronised for first oestrus with IVDs, with O...