"Experientia docet" - Experience is the best teacher
Minerals and nitrogen in poultry manure
Poultry manure, potentially suitable as a ruminant f'eedstuff, was obtained from various sources Samples consisted of pure excreta from birds kept in batteries, broiler excreta on deep litter systems and pullet and breeder excreta on deep litter systems. Large variations…
Effect in ewes of oestrogen priming and GnRH on LH release and luteal function during early lactation in spring
The effects of oestrogen priming and GnRH administration on the release of LH and on luteal function were investigated using 66 spring-lambing S.A. Mutton Merino ewes in early lactation. Seven randomly selected groups of ewes received either (i) 30 μg…
Crossbreeding with Africander dam as basis. 2.Weaning performance of progeny of various sire breeds
Weaning mass was studied for 753 calves out of Africander cows by Africander, Brahman, Charolais, Hereford and Simmentaler sires. Crossbreds performed 11,1 per cent to 11,8 per cent better than Africander controls. Charolais progeny had a significantly greater weaning mass…
Crossbreeding with Africander dam as basis. 3. Post-weaning growth performance of prgeny of various sire-breeds
Post-weaning growth performance was studied for 342 steers out of Africander cows and by Africander, Brahman, Charolais, Hereford and Simmentaler sires. In a system of intensive fattening, the latter three Bos taurus sire-breed progeny-groups performed strikingly better than the former…
Fineness and concentrate to low quality roughage ratio of complete diets for dairy cows. 1. Intake and digestibility under ad li
Thirty six lactating cows were used in a trial with a partially balanced change-over design to determine the effect of the fineness of roughage and concentrate to roughage ratio on intake and digestibility. Nine rations were used with combinations of…
Fineness and concentrate to low quality roughage ratio of complete diets for dairy cows. 2.Milk production and composition
Thirty six lactating cows were used in a trial where low quality maize straw was used as a roughage source in complete diets. The effects of fineness of roughage and concentrate to roughage ratio on milk production and milk composition…
Protein and/or energy supplementation of lactating beef cows during the early summer period in northern Natal
An experiment was conducted to investigate the effects on the reproductive performance of lactating beef cows of supplementation with protein and/or energy during a 100 day period. Over three years the average recalving percentage for the cows receiving energy rich-,…
The effect of a direct fed microbial (Megasphaera elsdenii) on the productivity and health of Holstein cows
Sixty high-producing multiparous Holstein cows were used in a randomized complete block design experiment to determine the effect of a direct-fed microbial (DFM), Megasphaera elsdenii NCIMB 41125 (Me), on dairy cattle productivity and health. The cows received one of two…
Association of polymorphism of the alpha 1-antitrypsin gene with milk production traits in Chinese Holstein
Protein degradation in bovine milk affects the quality of dairy products. Alpha 1-antitrypsin (AAT) can protect vulnerable elastic tissues from degradation by neutrophil elastase. The aim of this study was to assess the association of polymorphisms in bovine AAT gene…
Microsatellite-based characterization of Southern African domestic pigs (Sus scrofa domestica)
This paper details genetic characterization and trends from a microsatellite-based study of genetic diversity on southern African pig populations. A total of 351 pigs from three commercial breeds and three indigenous populations were genotyped at 39 loci. Differences among the…
Hormone levels in peripheral plasma of the Afrikaner cow 1. Progesterone and luteinizing hormone levels during the oestrous cycl
Concentrations of progesterone and luteinizing hormone were determined in peripheral blood plasma during the oestrus cycle of three non-lactating Afrikaner cows. Blood samples were drawn daily during the luteal phase (Day 3-16) and every 8 hours from Day l7 to…
Hormone levels in peripheral plasma of the Afrikaner cow II Progesterone and total unconjugated oestrogen levels during late ge
Progesterone and total unconjugated oestrogen concentrations in the peripheral blood of 4 Afrikaner cows during late gestation and parturition were determined by RIA. From l2-18 days prepartum, progerone levels ranged .from 8.4 to 13,0 ng/ml and subsequently declined to 3,7-8,2…
Hormone levels in the peripheral blood of the Afrikaner cow III Progesterone levels during the post partum period
Following parturition blood samples were collected daily from 5 mature lactating cows until the first post partum oestrous period. Plasma progesterone concentration as determined by RIA was applied to evaluate post partum ovarian activity. Parturition to first oestrus varied from…
The performance of a beef breeding herds subjected to continuous mating in the valley bushveld of the Eastern Cape
In a five-year study made on beef cows ranched in the Fish River valley of the Eastern Cape with bulls being run continuously with the cows, an average calving percentage of 80,3 was achieved. Yearly calving percentages were positively correlated…
Use of anise seed and/or α-tocopheryl acetate in laying Japanese quail diets
An experiment was conducted to investigate the possible use of anise (Pimpinella anisum) and/or α-tocopheryl acetate as dietary supplements on the performance and some egg quality characteristics of laying Japanese quail. One hundred and eight Coturnix japonica quail (72 females…
Die invloed van twee veebeladings op die samestelling van die dieet en inname van skape in ’n drie-kampstelsel in die sentrale O
The influence of two stocking rates on diet composition and intake of sheep in a three camp rotational grazing system in the central Orange Free State A study was made of the nutritive value of native pasture for sheep in…
Die invloed van cultivar, omgewing en bemesting op sekere chemiese eienskappe van sonneblomsaad
The study was conducted firstly to establish the influence of cultivar and environment on the protein-, amino acid and ether extractable oil concentration of sunflower seed and secondly to study the influence of soil pH and fertilization on the protein…
