Two groups of cows had either free and continuous access to a urea supplement or access to the same supplement for only four days per week. Cows from both projects overwintered on rested summer range while all the cows received…
Utilization of monensin in protein-energy licks by lactating ewes on sour winter veld; (a) Preweaning. The influence of monensin, at a level of 0,36 mg/kg body mass, to ewes in high and low energy licks (HEL and LEL) and in…
Utilization of monensin in protein-energy licks by lactating ewes on sour winter veld; (b) Postweaning. High (HEL) and low (LEL) energy protein licks, with and without monensin, were fed to Dohne Merino ewes before and after weaning on Dohne sourveld…
Eighty-four high- and moderate-yielding Friesland/Holstein cows were divided into four groups and fed ad libitum complete diets with crude protein levels of: Treatment 1, 16% (4 - 33 weeks postpartum), positive control; Treatment 2, 16% (4 - 17 weeks), 12%…
Six male and 24 female Pekin ducks per pen were randomly allocated to 12 pens to test the effects of quantitative feed restriction during the rearing period on subsequent reproductive performance. The feed treatments during the rearing periods were ad…
Different portions (stalks, cobs, plant leaves, and cob leaves) from mature dry maize plants remaining after grain harvest were collected on two occasions, 8 weeks apart. Composition (proportion of plant portions) differed considerably between first and second cutting dates. All…
Three groups of nine steers each were fed fattening diets, containing either non bird-resistant (NBR), paraformaldehyde-treated bird-resistant (PBR) or bird-resistant (BR) sorghum grain as the energy source, for 105 days. The BR group performed consistently worse than both the NBR…
Seasonally anoestrus Corriedale ewes receiving 1 ml GnRH (0,0042 mg buserelin-acetate) IM, were pretreated as follows: (i) 5 Days with intravaginal progesterone-impregnated sponges removed 24 h prior to GnRH (P-group); (ii) 6 h with subcutaneous oestradiol silicone rubber implants removed…
The relative importance of different components of efficiency depends on whether one's interest is biological or economic. A study of the elements of biological efficiency shows that the choice of slaughter mass has a profound effect, and that in relative…
Information on the production, processing, and marketing of lamb in New Zealand is presented. Consideration is given to new practices such as genetics and animal breeding, nutrition, and flock management that have been introduced in sheep farming to improve production,…
A number of management strategies that can be used to improve the production and reproduction rate and involving the pregnant/lactating cow, the heifer and the bull, are discussed. Some of the factors discussed for the pregnant/lactating cow are calving season,…
The need to optimize rather than maximize rates of reproduction has been demonstrated for various production situations. In a highly intensive system, incorporating the use of artificial insemination, increasing the calving rate from 75 to 85% did not yield more…
The nitrogen (N) content of material selected by cattle, Boer goats, Dorper and Merino sheep on natural Karoo pasture was investigated. A pronounced seasonal variation in the N content of selected material was found. No correspondence was recorded between the…
Thirty-one Ile de France stud rams raised in monosexual groups were evaluated for sexual behaviour using three 10-minute libido tests. Rams represented two age (± SD) groups namely, 455,2 ± 6,7 (n = 10) and 352,9 ± 11,0 (n =…
Diet selection and intake by cattle, goats and sheep was related to climatic factors by principal-component analysis. Digestibility of selected material and digestible organic matter intake per metabolic size (DOMI/kg W0.75) were significantly correlated to a principal component combining rainfall,…
The objective of this work was to study the effects of both Klason lignin (KL) and acid detergent lignin (ADL) on in vitro neutral detergent fibre (NDF) digestion (IVNDFd) in an effort to assess if acid labile phenolic compounds affect…
The effect of the feeding schedule and the use of additives on the intake and its rate were studied on animals consuming a temperate pasture. Twenty four wethers (47.8 ± 6.4 kg BW), housed in metabolism cages, were fed a…
Udder health considerably affects the economics of dairy farming. There are different reasons for poor udder health; one of them is the milking technique. In earlier studies it was shown that automatic milking systems (AMS) have advantages over conventional milking…
This study was aimed to estimate variance components and genetic parameters for daily fat and protein yields of Brazilian Holstein cattle, using an autoregressive test day multiple lactations (AR) animal model. Data consisted of test day (TD) records produced by…
