To observe the effects of supplemental dietary d-α-tocopherol in relation to dietary energy on growth and immune status in dairy calves, 32 newborn Holstein bull calves were assigned to 1 of 4 treatments for 5 wk in a 2 × 2 factorial, randomized complete block, split-plot design. Calves received moderate growth (MG) or low growth (LG) all-milk dietary treatments, formulated to support daily gai...

A molecular epidemiological study was conducted on 100 dairy (499 calves) and 50 beef (333 calves) farms in Belgium to estimate the prevalence of different Giardia duodenalis assemblages in calves younger than 10 weeks of age. Positive samples from the epidemiological study and from a previous clinical study were selected and genotyped based on the amplification of the beta-giardin gene. To inv...

Rumen development is an important factor determining early solid feed intake and performance in cattle. A popular trend towards early weaning of newborn dairy calves necessitated looking for ways of accelerating the gastrointestinal tract (GIT) development. The present study aimed to determine the effect of sodium butyrate (NaB) supplementation in milk replacer and starter diet on rumen develop...

In a national survey of US dairy operations, 1685 dairy operations reported 47,057 new dairy heifers (either births or acquisitions) and 4427 deaths (9.4%) of preweaned dairy heifer calves over a 3 month period. Stepwise logistic regression was used to identify management practices associated with high mortality among preweaned heifers in dairy operations where at least three dairy heifer calve...

Calf diarrhoea, the eighth most common cause of death in this age group, affects over 75% newborn calves under three weeks old. Fifty with diarrhoea from nine intensive dairy farms were assessed during study period. Of these, 72% (n =36) positive for E. coli There was a strong link between prevalence calf and groups. Therefore, those one month 1.3 more likely to be infected than months age. The...

The intensive rearing of cattle includes a whole range of technological processes that should enable continuous production and optimal use of production capacity. In such circumstances, newborn calves have to adapt to different environmental factors, including diet. The technology of growing calves diet was initially based solely on feeding colostrum and then milk. After that, the food introduc...

Bovine coronavirus (BCoV) infection has found worldwide among cattle of all ages, causing diarrhea in newborn calves, winter dysentery adult and respiratory tract diseases results major economic losses dairy herds. The objective this study was to establish an ELISA kits as patent prepared Lab. with assessment its applicability the field samples. Sixty-five pneumonic calves 2- 4-month-old, used ...

Welfare assessment of dairy calves is commonly conducted through the observation their behavior and analysis physiological parameters. Despite large number studies on this topic, there a lack research possible correlation between parameters at basal level in calves. For reason, present study aimed to investigate correlations serum cortisol, neutrophil-to-lymphocyte ratio (N/L) locomotor play 21...

faecal samples from 291 dairy calves from 10 dairy herds in kerman were examined to investigate theprevalence of cryptosporidium infection. cryptosporidium spp. oocysts were identified by using themodified ziehl-neelsen staining technique in 63 (21.65%) calves. calves were grouped according to theirage as follows: