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In 1996 in Mexico State (Mexico), 120 cycling cows were equally divided among 3 pens. Nine cows were induced to display oestrus with norgestomet implants, oestradiol valerate and GnRH on each of the first 3 days of the experiment. On the 1st day, 1 cow in pen 1, 5 in pen 2, and 3 in pen 3 displayed ...

López, L.; Galina, C. S.; Orihuela, A.
Tropical Agriculture, 1998, 75, 3, pp 405-408

The social order of 20 non-lactating, non-pregnant Brahman cows (2-6 years old) was determined by recording content and outcome of all agonistic interactions. The herd was observed at pasture for 1.5 h and in a yard for 2 h per day. This routine was undertaken every other day from 06.00 to 18.00 h...

Orihuela, A.; Galina, C. S.
Applied Animal Behaviour Science, 1997, 52, 1/2, pp 3-11