It has been shown by a number of workers that seasonal mating is desirable in the Queensland beef industry because of its effect on calf growth, and the Iiveweight of breeding cows. Sutherland (1961) reported that calves born following an October to December mating were approximately 45 kg heavier at 270 days of age than were calves born following a January to June mating. In addition, Stubbs (...

This experiment was conducted with the aim to define the weaning age of camel calves managed with pastoral farmers in eastern Ethiopia. Twenty camel calves (11 males and 9 females) were randomly assigned into five blocks based on their birth date. Calves within a block were further assigned to one of the four Treatments (T1, T2, T3, and T4). Calves in T1, T2, and T3 were weaned at 6, 8, and 10 ...

Soybean hulls (SBH) and soybean meal (SBM) were evaluated as potential supplements for preconditioning beef calves in Florida. Weaned calves were fed 4.76 lb/hd/d as fed of SBH or 1.40 lb/hd/d as fed of SBM for a 42-d preconditioning period. Calves fed SBH yielded higher preconditioning weight gains than calves supplemented with SBM (34.8 lb/ hd vs 22.3 lb/hd). An economic evaluation of precond...

Plasma samples from suckling beef calves, transport-stressed weaned calves, 500 kg feedlot cattle, and lactating dairy cows were analyzed for vitamin C, folic acid, pantothenic acid, and vitamin B12' Plasma from stressed calves also was analyzed for vitamin B6' Differences in plasma levels were detected between groups. Plasma vitamin C was highest in suckling calves, but similar for stressed ca...

Effects of weaning age on plasma VFA were examined using 16 Holstein heifer calves. Animals entered the study at 6 +/- 3.5 d of age and were fed 1.8 kg milk twice daily to 28 (early weaning) or 56 d (late weaning) and a commercial pelleted calf starter from 0 (early) or 28 (late) d. Blood was sampled once weekly for 14 wk. Total blood concentrations of VFA, acetate, propionate, and butyrate wer...

Records on 983 cows born during a period of 10 yr (1966 to 1975) were used to estimate longevity and lifetime productivity of cows raised under range conditions. The cows were from a purebred Hereford and two multibreed synthetic groups, one composed of beef breeds (Beef Synthetic #1) and the other composed of two-thirds dairy breeds and one-third beef breeds (Dairy Synthetic). The cows were ra...

The objective of this work was to evaluate the effect of very early weaning of calves in cull cows on nutritional quality of meat. Two treatments were assayed: cull cows with very early, thirty days, weaned calves (CVEW) and cull cows with traditionally, seven months, weaned calves (CTW). Cows with very early weaned calves were grazed on pasture, meanwhile cows with traditional weaning were gra...

The objective herein was to estimate heterosis and breed effects in purebred and crossbred Romosinuano, Brahman, and Angus calves on acute phase protein response to weaning and transportation. Calves (n = 1,032) were weaned in September of 2002, 2003, and 2004 at approximately 7 mo of age. Approximately 28 d after weaning, steer calves (n = 482) were transported 1,800 km (20 h) to Oklahoma. Con...


 Pre-weaned beef and dairy calves that fail to receive mater­nal antibodies are more susceptible disease. A systematic review meta-analysis were performed evaluate the as­sociation between failed transfer of passive immunity (FTPI) disease in pre-weaned calves. Three data­bases searched for relevant studies evaluated diagnosed with FTPI at ≤8 days age recorded incidence pre-weaning. Twent...

Salmonellosis in calves has economic and welfare implications, and serves as a potential source of human infections. Our objectives were to assess the risk of Salmonella spread following its introduction into a herd of pre-weaned calves and to evaluate the efficacy of control strategies to prevent and control outbreaks. To meet these objectives, we developed a model of Salmonella transmission w...