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"Experientia docet" - Experience is the best teacher

Association of polymorphism in the alpha-1-antitrypsin gene with milk production traits in Holstein dairy cows

  • 2014
  • Issue: 2
  • Volume: 44
M. Heihavand-Kheiripour, A.H. Mahdavi, H.R. Rahmani, M. Soltani-Ghombavani & M.A. Edriss Page: 155 - 160

Alpha-1-antitrypsin (A1AT) as a strong protease inhibitor plays a major role in the protection of tissues against proteolytic destruction by neutrophil elastase. Existence of this protein in the mammary gland may increase the survival of milk proteins such as lactoferrin…

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Index-in-retrospect and breeding objectives characterizing genetic improvement programmes for South African Nguni cattle

  • 2014
  • Issue: 2
  • Volume: 44
L.E. Matjuda, M.D. MacNeil, A. Maiwashe, V.R. Leesburg & M. Malatje Page: 161 - 172

The goals of this research were to document the historical selection applied by Nguni breeders that contributed to the national genetic evaluation scheme, and to offer prospective breeding objectives to guide future selection practices. Genetic selection differentials, weighted by number…

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Genetic parameters and relationships of faecal worm egg count with objectively measured wool traits in the Tygerhoek Merino flock

  • 2014
  • Issue: 2
  • Volume: 44
P.A.M. Matebesi-Ranthimo, S.W.P. Cloete, J.B. van Wyk & J.J. Olivier Page: 178 - 188

The costs of internal parasite control and treatment are potentially very high in grazing sheep. Faecal worm egg count (FEC) has been suggested as a suitable criterion for selection for resistance to nematode infestation in livestock. Genetic parameter estimates for…

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Chemical composition of hulled, dehulled and naked oat grains

  • 2014
  • Issue: 2
  • Volume: 44
W. Biel, E. Jacyno & M. Kawęcka Page: 189 - 197

The objective of the work was to evaluate the influence of genetic and mechanical removal of hulls from oat grains on their nutrient content. The studies included three cultivars and six lines of oat grains. In grain samples of hulled…

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Breeding objectives for Holstein cattle in South Africa

  • 2014
  • Issue: 3
  • Volume: 44
C.B. Banga, F.W.C. Neser & D.J. Garrick Page: 199 - 214

Well-defined breeding objectives form the basis of sound genetic improvement programmes. Breeding objectives for Holstein cattle in South Africa were developed in the current study. Economic values were calculated for those economically relevant traits that had adequate bio-economic data, namely…

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Effect of pesticides applied in cowpea production on rumen microbial fermentation of cowpea haulms as reflected in in vitro gas production (Short communication)

  • 2014
  • Issue: 3
  • Volume: 44
C. Antwi, E.L.K. Osafo, D.S. Fisher, H.M. Yacout, A. Donkoh, A.A. Hassan, S.M.M. Sobhy, H.Adu-Dapaah & A.Z.M. Salem Page: 215 - 219

The present study assessed the effect of lambda cyhalothrin, cypermethrin and dimethoate residues in cowpea haulm on microbial fermentation using gas syringes as incubators. The lambda cyhalothrin, cypermethrin and dimethoate were applied at the vegetative, flowering and podding stages of…

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The relationships between faecal worm egg count and subjectively assessed wool and conformation traits in the Tygerhoek Merino flock

  • 2014
  • Issue: 3
  • Volume: 44
P.A.M. Matebesi-Ranthimo, S.W.P. Cloete, J.B. van Wyk & J.J. Olivier Page: 220 - 227

Subjectively assessed wool and conformation traits form part of the selection objective in wool sheep enterprises. The present study investigated the genetic, phenotypic and environmental correlations for nematode resistance (using faecal worm egg count (FEC)) with subjectively assessed wool and…

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The effect of Moringa oleifera leaf meal supplementation on tibia strength, morphology and inorganic content of broiler chickens

  • 2014
  • Issue: 3
  • Volume: 44
T.T. Nkukwana, V. Muchenje, P.J. Masika, L.C. Hoffman & K. Dzama Page: 228 - 239

This study was conducted to assess the effects of dietary Moringa oleifera leaf meal (MOLM) supplementation as a possible alternative to antibiotic growth promoters on bone breaking strength (BBS), tibia bone morphology and inorganic ash content in broiler chickens. A…

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Carbohydrase and protease supplementation increased performance of broilers fed maize-soybean-based diets with restricted metabolizable energy content

  • 2014
  • Issue: 3
  • Volume: 44
R.E. du Plessis & C. Jansen van Rensburg Page: 262 - 270

A trial was conducted to evaluate whether the addition of commercial enzyme preparations containing carbohydrases and a protease would increase the available metabolizable energy (ME) of maize-soya-based broiler diets. Seven thousand five hundred and sixty (7560) day-old Ross 788 chicks…

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Effect on feed intake, milk production and milk composition of Holstein cows by replacing maize grain with wheat in total mixed rations

  • 2014
  • Issue: 3
  • Volume: 44
C.J.C. Muller, J.A. Botha, F. Calitz & M. Lehmann Page: 271 - 279

The effect of replacing maize grain with wheat as an energy source in total mixed rations (TMRs) on feed intake and milk yield parameters was determined for dairy cows. Three feeding trials were conducted using different roughages, namely lucerne hay…

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Chemical composition and in vitro degradation of red and white mesquite (Prosopis laevigata) pods

  • 2014
  • Issue: 3
  • Volume: 44
L.Y. Peña-Avelino, J.M. Pinos-Rodríguez, L. Yáñez-Estrada, B.I. Juárez-Flores, R. Mejia & H. Andrade-Zaldivar Page: 298 - 306

The objective of this study was to compare the chemical composition and ruminal degradation of whole pod, exomesocarp, endocarp and seed fractions of red and white mesquite pods. The pods contained on average 220 g free sugars, 78 g crude…

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