Agustin Orihuela

Learn More
Although the order of entry to a handling chute is related to social rank, it is still not clear what the consequences are for Zebu cattle of occupying different ranks when being exposed repeatedly to a stressful handling procedure. Eighteen Brahman cows were observed for 243 h to obtain information on social interactions. From that information, indices of(More)
Estrus synchronization induces cows to gather in sexually active groups (SAGs) composed of females displaying mounting activity. Although this technique promotes the enhancement of sexual behavior, there are cows in estrus (CE) that delay estrus expression and also cows not displaying estrus (CNDE) even in the presence of a preovulatory follicle (PF). To(More)
The aim of this study was to compare the heart rate (HR) patterns in rams mated with estrous or nonestrous ewes and in mated estrous and nonestrous ewes () during courtship and mating. For this purpose, HR and behavior were recorded using a radio telemetry recording system and a closed-circuit television system with video recording, respectively. Rams were(More)
Reproduction in tropical sheep is not affected by season, whereas the reproductive cycle of temperate-climate breeds such as Suffolk depends on the photoperiod. Close contact with tropical ewes during the anestrous period might induce Suffolk ewes to cycle, making the use of artificial light or hormonal treatments unnecessary. However, the integration of(More)
BACKGROUND Measurement of salivary cortisol has been used extensively as a non-invasive alternative to blood sampling to assess adrenal activity in ruminants. However, there is evidence suggesting a considerable delay in the transfer of cortisol from plasma into saliva. Previous studies in cattle have used long sampling intervals making it difficult to(More)
In order to study the relative influence of social versus hormonal influences on sexual behaviour, three groups were formed from a herd of 16 Brahman cows, two of which groups were synchronized, implanting the second group the day the first had the Synchromate B (SMB) withdrawn. The third group was the untreated control. Cows in the sexually active group(More)
The effect of estrogen administered with norgestomet implants in the expression of behavioral estrous of Zebu cattle was studied in a herd of 18 cycling Brahman cows, in two trials. In the first and second trials, six different cows were treated with progestagen on successive days. In addition, in the first trial, estrogen injection was applied with the(More)
  • 1