The effect of increasing levels of fish· meal on true lysine availability in intact and caecectomized White Leghorn roosters. Protein-free diets containing increasing levels (0, 20, 40, 60, 80, and 99%) of normal and heat-damaged fish-meal were force-fed to…
The experiment was carried out over three seasons during which a total of 889 Afrikaner and 805 Simmentaler 'cow years' were studied. Nucleus breeding herds of each of these breeds were maintained at stations in the Highland Sourveld and the…
Four groups of 50 Merino ewes were mated to four Ronderib Afrikaner (RA), four Merino (M), four SA Mutton Merino (SAVM) and four Afrino (A) rams during the autumn of 1983 and 1984. During 1983 a further 50 Merino ewes…
Data from 129 young Simmentaler bulls taken at the end of the Phase C growth tests, were used to study the relationship of mass and growth parameters on testes size. Scrotal circumference was positively correlated with body mass and average…
Two batches of Ile de France ram semen frozen in 0,5 ml straws were imported from France during April 1979 and September 1981. Ewes were synchronized and artificial insemination was carried out either 54,5 h (fixed time single insemination) after…
A practical and repeatable method for the cooling, during the processing phase, of sheep semen, with the aim of minimizing inter-experiment variation is described. The superior repeatability of the method can be ascribed to the fact that the cooling rate…
It will be to the benefit of the feedlot industry if poor performing feeder cattle can be identified at an early stage during fattening and eliminated. This would require a close relationship between early performance and overall performance in the…
The influence of feeding level on the response of shorn Angora and Boer goats to cold exposure: The effect of nutritional level of shorn Angora and Boer goats on heat production, rectal and skin temperature as well…
The effect of the physical form (meal or pellets) of a dairy concentrate, with kikuyu grazing and oat silage as roughage sources, on milk, protein and butterfat production of Friesian cows was investigated. Twelve comparable Friesian cows from the same…
Eighteen F1 crossbred (commercial-type terminal crosses) pigs (boars, barrows and gilts) with an initial weight of 27.2 ± 2 kg were used to investigate the effect of porcine somatotropin (pST) administered for six weeks prior to slaughter on production parameters…
Records on 2 257 Composite and 5 923 Tswana calves born between the period of 1988 and 2006 in Botswana were used to calculate additive correction factors for the effects of sex of calf and age of dam on birth…
The reproductive potential of Dohne Merino ewes in an accelerated breeding system. Between 1967 and 1975 Dohne Merino ewes were kept on pastures and subjected to an accelerated breeding system at 8-month intervals. Both management and feeding programmes were improved…
The reproductive potential of Dohne Merino ewes in an accelerated breeding system. Between 1967 and 1975 Dohne Merino ewes were kept on pastures and subjected to an accelerated breeding system at 8-month intervals. Both management and feeding programmes were improved…
The effect of the standard of excellence for breed characteristics in Afrikaner cows on the pre-weaning performance of their calves was investigated. According to an analysis of variance, the standard of excellence for the head and horns had a statistically…
Five groups of seven Friesian bull calves received different combinations of soybean flour (S), whey powder (W), and preserved colostrum (C). On a dry matter basis, the experimental diets consisted of 20% S, 60% W, and 20% C (Treatment 1);…
A digestion and a growth trial was conducted, (i) to determine the effect of sodium hydroxide (NaOH) treatment of bird-proof sorghum (BPS) on nitrogen and energy digestibility, and (ii) to compare treated with untreated BPS as grain components in a…
A nitrogen-balance study was carried out to investigate the utilization of various levels of urea (0 - 4%) absorbed by alkali-ionophore-treated whole maize when fed to Angora goats receiving a protein-deficient roughage diet. Nitrogen retention was increased significantly (P<0,05) only…
A simple practical technique is described for the collection of blood samples from at least six cattle concurrently at short time intervals for up to 48 h. The technique is advantageous in that it is carried out under minimum stress…
Beef heifers were fed during late pregnancy to produce cows in poor, average, and good condition at calving late in winter. The animals were fed on dry-lot for the major part of the experiment. At 50 days of age half…
Fifty-four beef bulls with an average age of 21 months and representing nine breeds were evaluated for libido using two types of tests. The serving capacity (SC) test was repeated five times on groups of bulls and was followed by…
