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"Experientia docet" - Experience is the best teacher

Genetic and phenotypic trends for female fertility traits derived from service records of South African Holstein cattle

  • 2023
  • Issue: 4
  • Volume: 53
R.D. Kgari, C.J.C. Muller, K. Dzama & M.L. Makgahlela Page: 598 - 606

The objective of this study was to estimate breeding values (EBV) and genetic and phenotypic trends for female fertility traits derived from artificial insemination (AI) records. Data were collected from automated milk recording systems: 64464 records from 18 South African…

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Environmental and genetic factors affecting faecal worm egg counts in Merinos divergently selected for reproduction

  • 2015
  • Issue: 5
  • Volume: 45
Z. Mpetile, S.W.P. Cloete, A.C.M. Kruger & K. Dzama Page: 510 - 520

Infestation with gastrointestinal nematodes is probably among the most pervasive problems in small-stock production worldwide. Faecal worm egg count (FWEC) has been reported as an indirect measure of parasite resistance in livestock production. Environmental and genetic factors of FWEC were…

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Co-variances for reproduction, egg weight and chick weight in ostriches

  • 2004
  • Issue: 6
  • Volume: 34
S.W.P. Cloete, K.L. Bunter, Z. Brand and H. Lambrechts Page: 17 - 19

The study investigated genetic parameters for egg and chick production recorded over an 8-month breeding season, as well as average egg and chick weight for pair-bred ostrich females. Estimates of h² were moderate for reproduction traits and very high for…

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