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Abstract

In 1954, for 18 118 inseminations, the 60- to 90-day NR rate was 58.1% and the pregnancy rate 52.1%. Corresponding figures in 1975 for 161 720 inseminations were 57.0 and 47.3%. For 32 997 first inseminations (excluding heifers), the difference between NR and pregnancy rates was 6.7 percentage...

Author(s)
Heiman, M. M.
Citation
Praktische Tierarzt, 1977, 58, Spec. No., pp 114-116
Abstract

The effects of age at 1st insemination, herd size and climate on CR, and the relationship between CR and milk yield, are discussed. Annual milk production/cow in Israel averaged 4632 kg in 1954/55 and 7191 kg in 1974/75, while the 60- 90-day NR rate decreased from 58.5 to 55.0%. The economic...

Author(s)
Heiman, M. M.
Citation
Praktische Tierarzt, 1977, 58, Spec. No., pp 116-117
Abstract

Data on breeding, fertility, milk yields and their interrelationships, obtained for several large dairy herds, were analysed with a computer in order to establish the optimum economic calving intervals for dairy cows, taking into account such factors as interval between parturition and ...

Author(s)
Heiman, M. M.
Citation
Deutsche Tierarztliche Wochenschrift, 1976, 83, 12, pp 549-551
Abstract

Fertility and milk production data for 6 high-yielding dairy herds were studied. For 64 686 intervals between calving and 1st insemination of <40, 41-50, 51-60 and >61 days, pregnancy rate was 34.8, 37.6, 41.4 and 41.0% resp. In young cows, it was found that the greater the 1st calving interval the greater was the milk...

Author(s)
Heiman, M. M.
Citation
Deutsche Tierarztliche Wochenschrift, 1976, 83, 12, pp 549-551
Abstract

Author(s)
Heiman, M. M.
Citation
VIIth International Congress on Animal Reproduction and Artificial Insemination, Munchen, 1972, I, pp 591-594
Abstract

Bull semen quality and freezability decreased considerably from July to Oct. Fertility of cows was depressed from Aug. to Oct., while fertility of heifers was unaffected by climatic factors in the same period.

Author(s)
Heiman, M. M.
Citation
VIIth International Congress on Animal Reproduction and Artificial Insemination, Munich, 1972, Summaries., 1972, pp 409
Abstract

The breeding plan is described and selection intensity for bull dams, bull sires and test bulls is reported. Selection criteria are indicated. Annual genetic progress during the past 10 yr was 70 kg FCM (1.3%). 20% culling after performance testing of young sires increased the av. weight of all...

Author(s)
Heiman, M. M.
Citation
VIIth International Congress on Animal Reproduction and Artificial Insemination, Munich, 1972, Summaries., 1972, pp 394