The effect of heat processing on ruminal degradation, intestinal digestibility (UDP-D) and absorbable amino acid (AA) profile of cottonseed oilcake (CSOC) and soybean oilcake (SBOC) was calculated. CSOC and SBOC were roasted in a drum roaster at six temperature settings…
Weights and individual feed intake data of 30 Dorper crossbred ewes and their single-born lambs were collected from conception to weaning. The data were used to calculate actual weaning efficiency of the individual ewe-lamb units [AEFF = lamb weaning weight/DDMI…
Blood samples were withdrawn once weekly from the jugular vein of 10 karakul lambs (ca. 17 kg) for 12 weeks. The lambs were randomly allocated to a treatment and fed either a high-fibre (HF, n = 5) or low-fibre (LF,…
Different protein-energy ratios in feedlot diets may effect several combinations of amounts of amino acids and glucose available for absorption in the small intestine. In this regard, the effect of protein concentration and degradation, and energy content of the diet…
The effects were investigated of energy and protein concentrations (with associated amino acid concentrations) in ostrich diets on leather quality of the skins of 50 ostriches. Energy concentrations were 9.0, 10.5 and 12.0 MJ ME/kg diet and protein concentrations were…
Twenty Dohne merino wethers with an average mass of 52 kg, were used to study the effect of varying the fibre content of the diet on differences in ruminal concentrations of volatile fatty acids (VFA) and the partial digestion of…
Small-scale farmers in the rural areas of South Africa do not have milling and mixing facilities at their disposal. A study was conducted to quantify the production as well as the energy and nitrogen metabolism of pigs when fed a…
Grazing trials were established at two sites in the semi-arid savanna (Lowveld) of KwaZulu-Natal. The sites differed initially in rage composition. Llanwarne was dominated by Themeda triandra, Panicum maximum and P. coloratum and Dordrecht by Urochloa mosambicensis, Sporobolus nitens and…
Over a three-year period (1989 to 1991), non-lactating, pregnant Sussex beef cows were subjected to either strip or continuous grazing of maize-crop residues over the winter feeding period. Stocking rate was based on providing each cow with 10 kg dry…
Ten Dohne merino wethers with an average mass of 50 kg were used to study differencesin the use of energy by the splanchnic tissues and their metabolism of VFA, glucose and FFA when fed high- or low-fibre diets. Dietary carbohydrate…
The effect of migration on inbreeding is modelled for small populations with immigrants from a large unrelated population. Different migration rates and numbers for the two sexes are assumed, and a general recursion equation for inbreeding progress derived, which can…
Data, consisting of 4235 lamb records, obtained from the Foundation Afrino Sheep Stud at the Carnarvon Experimental Station, were used to investigate factors influencing birth weight, weaning weight, monthly body weight from five to 12 months, body weight at 18…
Nitrogen (N) retention and wool growth rate (WGR) responses to various amino acids and derivatives as well as protein sources were determined with six ruminally and six abomasally fistulated Merino wethers in two balanced cross-over design experiments. The six treatments…
In mild climatic regions, open camp systems (dry lots) may be used for dairy cattle. These have a lower capital investment cost than intensive housing systems although the management of open camps is more difficult. The effect of (a) an…
Average growth and body weight data, which comprised 745 400 weaning records and 14 990 Phase C growth records of young bulls of 16 breeds were obtained from the National Beef Cattle Performance and Progeny Testing Scheme and used in…
Multivariate prediction models were developed from the results of three divergent trials with multicannulated steers. Diets differed in composition and physical structure. Energy contents varied from 10 to 13 MJ ME/kg DM, starch from 20 to 62%, CP from 102…
The object of this study was to determine the influence of different stocking rates (viz. 2, 4, 6 & 8 sheep /ha for a six-month period) on the performance of Dohne merino ewes grazing Digitaria eriantha (Smuts finger grass) pasture…
Testes diameter of 110 Merino ram lambs was measured at 100, 260 and 550 days of age. At 80 days of age the LH response to exogenous GnRH was determined in these rams. During the breeding season at 18 months…
Over a three-year period (1986 to 1988), non-lactating, pregnant Sussex beef cows were subjected to grazing maize crop residues over the winter feeding period at one of three stocking rates [1.75 (LSR), 3.5 (MSR) or 5.26 (HSR) cows /ha]. Cows…
