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Editorial

  • 2018
  • Issue: 1
  • Volume: 48
V. Muchenje Page: 1 - 1

In 2016-17, the impact factor of the South African Journal of Animal Science (SAJAS) reached an all-time high of 0.678. We attribute this improvement to the high quality of submissions that we receive from authors and the commendable efforts of…

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Effects of exogenous tannase enzyme on growth performance, antioxidant status, immune response, gut morphology and intestinal microflora of chicks fed grape pomace

  • 2018
  • Issue: 1
  • Volume: 48
S. K. Ebrahimzadeh, B. Navidshad, P. Farhoomand & F. Mirzaei Aghjehgheshlagh Page: 2 - 18

An experiment was conducted to study the effects of dietary addition of tannase to feed of chicks including grape pomace (GP) on growth performance, antioxidant status, immune response, blood parameters, gut morphology, intestinal microflora, liver function, and histopathological responses. The…

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Relationship of ewe reproduction with subjectively assessed wool and conformation traits in the Elsenburg Merino flock

  • 2018
  • Issue: 1
  • Volume: 48
P. A. M. Matebesi-Ranthimo, S. W. P. Cloete, J. B. van Wyk & J. J. Olivier Page: 29 - 38

Subjectively assessed wool and conformation traits are widely used to select breeding ewes and rams in the sheep industry. Data from a Merino flock that is maintained at Elsenburg Research Farm were used to investigate animal model (co)variance components for…

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Comparison of greenhouse gas emissions from Mexican intensive dairy farms

  • 2018
  • Issue: 1
  • Volume: 48
J. A. Rendón-Huerta, J. M. Pinos-Rodríguez, E. Kebreab, J. C. García-López & J. G. Vicente Page: 48 - 55

The objectives of this study were to compare estimates of greenhouse gas emissions (GHG) as CH4 (enteric-manure), N2O (manure), and CO2 (fuel and energy use), the use of water and soil, the excretion of nutrients in manure, and feed efficiency…

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Altered tissue mineralization, increased hepatic lipid and inhibited autophagy in intrauterine growth retardation piglets

  • 2018
  • Issue: 1
  • Volume: 48
C. Wang, X.C. Zheng, F.A. Siyal, D. Babazadeh, T. Ayasan, K. Cheng, J.H. He, W. Xu, L.L. Zhang, X. Zhong & T. Wang Page: 56 - 66

Mineral homeostasis is often disrupted in intrauterine growth retardation (IUGR) infants. Most studies focus on calcium or phosphorus metabolism of IUGR infants via determining serum mineral concentrations instead of tissues. This study was conducted to investigate the effects of IUGR…

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Effects of supplemental seminal plasma on cryopreserved boar sperm quality (Short communication)

  • 2018
  • Issue: 1
  • Volume: 48
M. Barrientos-Morales, M. Barrientos-Villeda, B. Domínguez-Mancera, J. M. Pinos-Rodríguez & M. L. Juárez-Mosqueda Page: 67 - 70

To analyse the effects of supplemental autologous seminal plasma on boar semen quality before freezing and after thawing, thirty ejaculates were collected from six Pietrain boars. The main factors of a 2 x 2 x 2 factorial arrangement of treatments…

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Effects of short and extended fasting periods and cattle breed on glycogenolysis, sarcomere shortening and Warner-Bratzler shear force

  • 2018
  • Issue: 1
  • Volume: 48
H. A. O’Neill, E. C. Webb, L. Frylinck & P. E. Strydom Page: 71 - 80

The effects of short (three hours) and extended (24 hours) feed withdrawal periods and three cattle breeds on muscle energy metabolism, sarcomere length, and meat quality were investigated. Brahman (Br), Nguni (Ng), and Simmental (Sm) bulls were subjected to ante-mortem…

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Effect of feeding duration of Spirulina platensis on growth performance, haematological parameters, intestinal microbial population and carcass traits of broiler chicks

  • 2018
  • Issue: 1
  • Volume: 48
S. Sugiharto, T. Yudiarti, I. Isroli & E. Widiastuti Page: 98 - 107

Spirulina platensis is a good candidate as an in-feed antibiotics substitute for broilers. However, its use seems impractical owing to its high price, especially when being administered throughout the whole rearing period. This study aimed to investigate the effects of…

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Optimization of in vitro culture and transfection condition of bovine primary spermatogonial stem cells

  • 2018
  • Issue: 1
  • Volume: 48
A. Jafarnejad, M. Aminafshar, M. Zandi, M. R. Sanjabi & N. Emamjomeh Kashan Page: 108 - 116

The present study aimed to optimize the in vitro culture and transfection efficiency of bovine primary spermatogonial stem cells (SSCs). To this end, SSCs were obtained from newborn Holstein bull calves by two-step enzymatic digestion. After enrichment and culture, SSCs…

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Assessment of genetic variation among four populations of Small East African goats using microsatellite markers

  • 2018
  • Issue: 1
  • Volume: 48
A. S. Nguluma, Y. Huang, Y. Zhao, L. Chen, G. Msalya, C. Lyimo, E. Guangxin & S. W. Chenyambuga Page: 117 - 127

The majority of goats in Tanzania belong to the Small East African (SEA) breed, which exhibits large phenotypic variation. This study aimed to determine the genetic structure of, and relationships among four populations (Sukuma, Gogo, Sonjo, and Pare) of the…

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Genetic diversity in Zimbabwean Sanga cattle breeds using microsatellite markers

  • 2018
  • Issue: 1
  • Volume: 48
E. Gororo, S. M. Makuza, F. P. Chatiza, F. Chidzwondo & T. W. Sanyika Page: 128 - 141

Zimbabwe’s smallholder land-based livelihoods are dominated by the three local Sanga cattle breeds, namely Mashona, Tuli, and Nkone. A study was carried out to determine genetic diversity and differentiation among conservation populations of these breeds using 16 bovine-specific microsatellite markers.…

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Effects of chitosan addition on growth performance, diarrhoea, anti-oxidative function and serum immune parameters of weaned piglets

  • 2018
  • Issue: 1
  • Volume: 48
Y. Q. Xu, Z .Q. Wang, Z. Qin, S. M. Yan & B. L. Shi Page: 142 - 150

The present experiment was designed to determine the efficacy of a commercial source of chitosan (CS) to enhance performance, anti-oxidative function, and immune response in weaned pigs. A total of 60 crossbreed piglets (Duroc × Landrace × Yorkshire), with average…

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Effects of sesame meal on intake, digestibility, rumen characteristics, chewing activity and growth of lambs

  • 2018
  • Issue: 1
  • Volume: 48
B. Ghorbani, A. Teimouri Yansari & A. Jafari Sayyadi Page: 151 - 161

Two experiments were carried out to determine ruminal degradability of sesame meal (SSM) and its effects on intake, digestibility, rumen parameters, chewing activity, and lamb performance when it replaced soybean meal (SBM). Degradability of dry matter (DM) and crude protein…

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Feed preference of grower ostriches consuming diets differing in Lupinus angustifolius inclusion levels

  • 2018
  • Issue: 1
  • Volume: 48
T. S. Brand, J. A. Engelbrecht, J. van der Merwe & L. C. Hoffman Page: 170 - 185

Feed costs contribute the largest proportion of the input costs of slaughter birds in an intensive ostrich production unit. Alternative, cheaper feedstuffs, such as lupins (sweet and bitter cultivars), were therefore evaluated to determine the optimal lupin inclusion level in…

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Effects of varying sweet lupin dietary inclusion levels on feather classes, leather traits and meat composition of feedlot ostriches

  • 2018
  • Issue: 1
  • Volume: 48
T.S. Brand, J.A. Engelbrecht, J. van der Merwe & L.C. Hoffman Page: 186 - 197

The main consumer products derived from ostriches are feathers, leather and meat. Despite progress in optimizing production practices, additional information is still necessary about the value of various raw materials as feed to ensure cost-efficient production. This study aimed to…

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