3. 977 lactating, non-pregnant cows from which calves were weaned between examinations. 4. All cows (1,567) not lactating at the second examination. This is classes 1 and 3 combined. 5. All cows (1,537) lactating at the examination after mating. This includes all class 2 plus a small number of cows of the same history which were not examined at the first examination. It also includes lactating cows with calves aged 6-7 months at foot, but whose calves were not weaned. Each cow's record was placed on a computer card, and the computer was programmed to-produce two way tables relating body condition, pregnancy and lactation status at successive examinations in the same cows. Where appropriate, contingency tables were produced and analysed by chi square. ReSUltS The data were examined for each mating period Materials and Methods for each of the five years and, because of the small A system of recording reproductive perfor- number per sub-class, were pooled over years mance was established in a beef herd at "Meadow- within mating periods. No difference could be bank", Mt. Garnet, Queensland, (Rankine and detected between mating periods, so the data are Donaldson 1968; Hassall, Rankine and Donaldson presented pooled over
Australian Veterinary Journal – Wiley
Published: Dec 1, 1969
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