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...

BACKGROUND Application of assisted reproductive technologies in buffaloes is limited to some extent by farmers' inability to detect oestrus because of its poor expression. The present study aimed at investigating reliability of a milk progesterone enzyme-linked immunosorbent assay (ELISA) to assess the ovarian cyclicity during post partum, oestrus and post-breeding periods in water buffaloes. ...

Effect of free gossypol present in the cottonseed cakes was investigated using 12, Nili-Ravi dairy buffaloes randomly assigned to two equal groups i.e., A and B. Buffaloes in group. A were fed control ration and buffaloes in group B were fed cottonseed cake ration containing 5.88g free gossypol. Non­ significant differences were found between control and treated buffaloes in respect of occurren...

The pregnancy rate resulting from matings at a single oestrus in beef cattle averages 70% for natural mating (Turman, Laster, Renbarger & Stephens, 1971) and 60% for artificial insemination (Laster, Glimp & Gregory, 1972). The sources and causes of low pregnancy rates have not been defined, but might include variation in time of ovulation relative to deposition of spermatozoa in the female repr...

Anterior pituitary gland fragments removed from female rats at various days of the oestrous cycle were perifused into small Biogel columns. After 2 hours stabilisation, the tissues were exposed at the beginning of each of five hours of perifusion to a volley of six 1-mi pulses of LHRH (10M1 8, given 4 min.apart. Pituitary glands removed during oestrus or met-oestrus showed little change in the ...

This paper reviews the current automation methods of oestrus detection in group housed sows and points out their limitations. Results from non-automated methods are also presented, in an effort to draw conclusions to assist in the development of new automatic methods. Automatic measurement of physical traits, e.g. body temperature, collect non-specific information but may be combined with activ...

OBJECTIVE We report a rare case of a 51-year-old woman with ocular and nasal infestation by Oestrus ovis. METHOD Clinical case report and review of current literature regarding nasal and ophthalmomyiasis. RESULTS Myiasis is infestation of the tissues and organs of vertebrates by certain dipteran fly larvae. Oestrus ovis myiasis is endemic in the region from North Africa to South Asia, but f...