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TheDairySite Newsletter - 17 May 2013

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TheDairySite
Friday 17th May 2013.
Michael Priestley - Editor

Michael Priestley
Editor


Dry Period Heat Stress Affects Calves Too

Heat Stress not only affects lactating and gestating heifers but can compromise calf development due to lower birth weights and reduced immunity, researchers have discovered.

Calves born to heat stressed cows were 13 pounds lighter than normal calves at birth and 28 pounds lighter at weaning, according to tests done on heifer calves at the University of Florida.

Reduced absorption of antibodies in the colostrum was a principle cause for smaller calves at weaning.

The research, published in the Journal of Dairy Science, said that although Immunoglobin (IgG) content in the mother’s milk was not affected, the efficiency at which it was absorbed by the calf was reduced.

This was found by taking 34 dry cows 45 days prior to calving and exposing them to one of two temperatures. Half received ambient conditions and the other half were exposed to cooling from fans and sprinklers.

Heat stress in gestating cows was gauged by measuring rectal temperature, feed intake and milk production during the subsequent lactation.

The test showed calves from heat stressed dams had lower lgG concentrations for the first 28 days when compared with calves from cool cows. This indicates reduced passive transfer of immunity.

But, cell-mediated immunity was also compromised in heat stressed calves. This was done by serological tests that analysed white blood cells.

Fewer lymphocytes were present in circulation when measured at 7, 28, 42 and 56 days of age. This was assessed by B Cell and T Cell responses, although the scientists caveated that B-cell function cannot be determined from the study.

No difference in average daily weight gain between the two groups of calves was found. Likewise, body weight and height of withers from weaning to seven months of age was not impacted either.

However, as summer approaches, members of staff at Penn State University are urging farmers to scrutinise barn ventilation and evaluate cooling strategies as summer approaches.

They say that additional calf development data should persuade farmers to treat heat stress not simply as a welfare and milk output problem but one that clearly impact on replacements and youngstock enterprises further down the line.


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This Week's Articles and Analysis

Alfalfa For Grazing
With total season weight gains of over 800lb/acre observed in trials and demonstrations, alfalfa grazing could be a worthwhile way of extending the productive life of your alfalfa hay stands, according to Garry Lacefield, University of Kentucky.

Predicting Grass Silage Timing 2013
Irish farmers are being advised to walk silage frequently to assess crops, after a delayed spring has caused growth rates to fall to around a third of average at 20 kg dry matter per hectare for April.

Heat Stress During the Dry Period Affects Calves Too
Research from the University of Florida shows that calves exposed to heat stress before birth have lower birth weights and compromised immunity.

New Discovery Makes Detecting Johne’s Disease Easier
USDA scientists have got round the issue of inaccurate Johne's disease testing by finding an antibody that specifically reacts to the Johne's bacterium.

Lactation Biology Symposium: Circadian Clocks as Mediators of the Homeorhetic Response to Lactation
Homeorhetic controls are based on time-dependent changes in metabolism to establish a new physiological state, such as pregnancy or lactation, according to researchers T.Casey and K Plaut who revealed their paper at on Circadian clocks at the Lactation Biology Symposium.

Market Reports

Irish CSO: Consumer Price Index April 2013
USDA Feed Outlook - May 2013
USDA National Dairy Products Sales Report - 15 May 2013
UK March Agricultural Price Index - 16 May 2013
Utilisation of Milk by Dairies in England & Wales – March 2013

Global Dairy Industry News

   Global

Another Rise for Global Food Price Index
FAO Reports Strong Cereal Production and Food Price Rise

   Korea, South

USGC Co-Products Conference Reassures Long Term Korean Customers of US Partnership

   United States

USDA Awards Funding For Research into Climate on Cattle
Agriculture and Livestock Remain Biggest GHG Sources
NFU: 2013 Farm Bill Gaining Momentum
NFU Weighs in on Trade Negotiations
NFU Outlines Farm Bill Priorities for Senate
Farmers Urge House Negotiators to Leave Supply Management Alone
NFU Outlines Farm Bill Priorities for House Committee on Agriculture
NFU, JA Zenchu Statement on Lima Round of TPP Negotiations
NFU Encouraged by 2013 Farm Bill Momentum

   European Union

EU Food and Feed Regulations to be Revised
EU Brings Reform of CAP Step Closer
Producer Groups Oppose Supply Management After Quota Removal

   Denmark

Calving Cows Prefer Sand and Straw to Rubber Mats
Seaweed Energy Solutions Makes Acquisition to Cultivate 100,000 Tons of Seaweed

   Canada

Unique Red and While Holstein Joins Stud

   Bolivia

Mercosur Inspections Asses Cattle Health and Border Control

   Spain

Farmers Union Demands Milk Contract Mediator
Beef and Dairy Cattle Receive More Funding Per Head

   United Kingdom

Sainsbury's Farmers Offer Cash Back Incentive for Sustainable Farming
Survey Suggests Rural Economy 'Spiralling Towards Recession'
Respond to Poor Spring Temperatures With Appropriate Fertiliser Plan
NFU President: Challenge MPs on CAP
February Figures Show Another 3000 TB Cullings

   Peru

OIE to Grant FMD Free Status to Peru

   Germany

Minister Calls on Companies to Share Cost Burden of Food Controls

   China

OIE Reports Another FMD Outbreak in Xinjiang
FMD NEWS: OIE Reports Another FMD Outbreak in Xinjiang

   Brazil

Indigenous Communities to Get FMD Help

   Ireland

Positive Discussion on Key CAP Reform Issues

   Ukraine

Farmers Must Invest and Register Cattle

   Kazakhstan

OIE: New FMD Outbreak Results in Quarantine Measures

   Australia

Drought-Hit Farmers Given National Parks Lifeline
MLA: Weekly Cattle Summary

   Philippines

Philippines Agriculture, Fisheries Grows 3.3 Per Cent in Q1 2013

   India

Anantapur Fodder Crisis Means Slaughter of Pregnant Cows

   New Zealand

'Steady as She Goes' Budget Gets Approval
Effluent Pond Design Course Progressing Slurry Storage

   Sri Lanka

Official Laboratories To Issue Dicyandiamide Certification on Powder

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