Research

In this study, upper critical values of the temperature-humidity index (THI) were determined in Holstein bull calves (n = 16) based on noninvasive physiological variables. Meteorological and animal-based data were recorded for a 4-d period following a 24-h habituation.

Calves born to cows exposed to heat stress during late gestation (i.e., the dry period) have lower birth weight and weaning weight and compromised passive immune transfer compared with those born to dams that are cooled.

Heat stress has a myriad of effects on dairy cattle across the life cycle. Whereas, the most commonly recognized impacts are associated with production responses, emerging evidence indicates that heat stress profoundly alters the immune response of calves and cows, from the prenatal stage through lactation.

Heat stress causes significant negative responses in the dairy industry. The
objective of this study was to assess the eect of heat stress on the autophagy and apoptosis of the rumen, abomasum, duodenum, liver and kidney in calves.

Data were collected prospectively on parameters related to first calving on 18 farms located in Northeastern Pennsylvania. This project was designed to study possible residual effects of calf management practices and events occurring during the first 16 wk of life on age, BW, skeletal growth, and body condition score at
first calving.

Heat stress has well-known influences on dairy calf physiology, but less is understood about calf behavioral responses to heat
stress. Herein, we evaluated milk replacer intake, standing activity, and lying behaviors of calves exposed to prenatal or postnatal heat
stress or both.

Learn more about the effects of heat stress on animals and how a nutritional solution can mitigate the negative effects of heat stress during the milky phase.

Immune Supporting Properties of Milk
Part 4: Remaining members of the innate immune system in milk – The oxidase enzymes, milk fat globule membrane and osteopontin

Immune Supporting Properties of Milk
Part 4: Remaining members of the innate immune system in milk – The oxidase enzymes, milk fat globule membrane and osteopontin

Feeding colostrum or a 1:1 colostrum: milk mixture for 3 days postnatal increases small intestinal development and minimally influences plasma glucagon-like peptide-2 and serum insulin-like growth factor-1 concentrations in Holstein bull calves.

Calf milk replacers (CMRs) are typically formulated from a range of lower-value milk products and may have reduced curding
ability when casein proteins are absent or denatured. Whilst there are industry claims that vealer calves in Europe can be reared on
such CMRs, there is no NZ data to substantiate these claims.

Calf-rearing practices were surveyed on 297 dairy farms with an average of 82 heifer and 24 bull calves reared. Only 21% of
the properties fed colostrum immediately on arrival at the dairy shed, and 30% did not feed their calves for at least 8 hours after
pickup.

Reducing Calf Morbidity on Dairy and Beef Farms.  A graduate has been co-funded in this company by the European Regional Development Fund and Enterprise Ireland under the Border, Midland and Western Regional Operational  Programme 2014-2020.

Calves fed hay in conjunction with a high-quality milk replacer have achieved higher weight gains than those offered straw.

Last year Northern Irish farmers Chris Catherwood and Jason Rankin won the All Ireland calf rearer of the year award and received a computerised machine as a prize. For the last two years the calves on the Cannon farm had been reared using teated feeders and were fed a skim and buttermilk based milk replacer once a day (OAD).

Effect of feeding meadow hay or winter barley straw on the performance of artificially reared dairy-bred beef calves to 12 weeks.

Milk fat globule membrane isolated from buttermilk or whey cream and their lipid components inhibit infectivity of rotavirus in vitro.

Evaluation of early weaning concentrate quality on the performance and health of artificially reared beef calves to 12 weeks by Harper Adams University.