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V. A.B. progeny in A.B. herds
| Content Provider | Scilit |
|---|---|
| Author | Macmillan, K. L. Jackson, R. G. |
| Copyright Year | 1976 |
| Description | Results from a questionnaire sent to users of the A.B. service provided by Livestock Improvement Associations in 1973 showed that only 84% of the heifer calves reared as potential replacements were A.B. progeny, another 10% of the calves were progeny of a herd sire, and the remaining 6% were the progeny of a sire used with maiden heifers. Only 47% of herd owners reared only A.B. progeny and another 34% reared at least one heifer calf produced by a 2-year-old heifer; the latter was more common in large herds. Among herd owners rearing at least one A.B. heifer calf, 69% endeavoured to obtain and rear only A.B. progeny. The difference between the 69% of herd owners wanting and the 47% of herd owners rearing only A.B. progeny may be the result of patterns of A.B. usage. One reason could be the practice of rearing only heifer calves born during the first 5 weeks of the calving programme. Although the mean range in the age of heifer calves was 6.9 weeks, 33% of herd owners using A.B. had calves with age ranges of 5 weeks or less. The reduced rate of genetic improvement resulting from rearing other than A.B. progeny is discussed. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/03015521.1976.10425838?needAccess=true |
| Ending Page | 20 |
| Page Count | 6 |
| Starting Page | 15 |
| ISSN | 03015521 |
| DOI | 10.1080/03015521.1976.10425838 |
| Journal | New Zealand Journal of Experimental Agriculture |
| Issue Number | 1 |
| Volume Number | 4 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 1976-03-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: New Zealand Journal of Experimental Agriculture Agriculture and Animal Production Herd Progeny A.b Heifer Calves Sire Calf Owners Rearing |
| Content Type | Text |
| Resource Type | Article |
| Subject | Earth and Planetary Sciences Environmental Science Horticulture Agronomy and Crop Science |
