The Broad Impacts of the Immune System on Dairy Cattle Production
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1 The Broad Impacts of the Immune System on Dairy Cattle Production Cornell Nutrition Conference 2017 Immunity in Dairy Cattle: What is a Healthy Cow? Derek McLean, Ph.D. Phibro Animal Health Corporation 1 Aelbert Cuyp River landscape with cows Aelbert Cuyp Cattle near the Maas, with Dordrecht in the distance 17 th Century 1
2 The theme for today Broad impact of immune system The maintenance of health Requires interaction of physiological systems Dynamic shifts in tissue and organ function Stable immune function during shifts Immune system - Extraordinary Challenge Milk contamination Decreased milk production Mastitis Irregular heats Low conception rates Ovarian Cysts Embryonic Loss Gastroenteritis Intestinal hemorrhages Impaired rumen function Diarrhea Ketosis Provides the animal the foundation for health and optimal performance What could go wrong? Laminitis Mobility Decreased feed intake Lower milk production Decreased feed efficiency Broad impact of immune system What is the link? Inflammation Heat Stress What are common elements of these physiological systems? Reproduction How to measure health? Ruminal Acidosis/Laminitis The Anatomies of Animals Virtues Household Physician ca. 1930s 2
3 Impact on the Immune system physiological systems need energy Metabolism Milk contamination Decreased milk production Mastitis Irregular heats Low conception rates Ovarian Cysts Embryonic Loss Gastroenteritis Intestinal hemorrhages Impaired rumen function Diarrhea Ketosis Feed Efficiency Dairy Fraction of feed energy or dry matter captured in products Feed efficiency doubled in the last 50 years genetic selection and management for productivity Goes to products energy for maintenance is lost Laminitis Mobility Decreased feed intake Lower milk production Decreased feed efficiency Undesirable side effects from selection Energy Related Disorders Decline in feed intake Impaired calcium homeostasis NEFA Ketone body Glucose requirements of an activated immune system Significant energy is required for immune response Kvidera et al., JDS
4 Glucose requirements of an activated immune system Acutely activated immune system uses > 1kg of glucose Resource Allocation Decision 1⁰C: 7-15% increase metabolism Infection: 7-29% increase Milk contamination Decreased milk production Mastitis Irregular heats Low conception rates Ovarian Cysts Embryonic Loss Gastroenteritis Intestinal hemorrhages Impaired rumen function Diarrhea Ketosis Kvidera et al., JDS 2017 Maintaining euglycemia did not rescue milk synthesis Laminitis Mobility Decreased feed intake Lower milk production Decreased feed efficiency Predict cows that have tolerance to resource drain Moyes et al., 2013 Physiologic Imbalance Index urea nitrogen, albumin, cholesterol, NEFA, glucose, and BHBA Trevisi et al., 2012 Bertoni & Trevisi, 2013 Liver Functionality Index albumin, cholesterol, bilirubin How to think about resource allocation in cows differently? Tolerance Predictor of disease one week after calving Higher liver function may produce more milk 4
5 Provide a means for cows to resist or tolerate resource challenge Link between immune cells and dairy cow health, reproduction and productivity Banos et al., 2012; Denholm et al., 2017 Higher ratios of CD4+:CD8+ cells associated with lower somatic cell counts Provide a means for cows to resist or tolerate resource challenge Hypothesis: OmniGen-AF supplementation will regulate memory immune response Evaluate humoral and cell mediated immune responses to BHV-1 and BVDV type 1 and 2 viruses as components of a MLV BRD vaccination program in dairy heifers David Hurley & Steve Nickerson U. of Georgia Negative correlation between percentage of eosinophils and milk yield, feed intake, dry matter intake and metabolizable energy intake CD335+ natural killer cells were positively correlated with the incidence of mastitis Antigen Recall OmniGen-AF Immune System Metabolism and Tolerance Proliferation Index OmniGen-AF Control BHV-1 induced stimulation Day relative to booster vaccination OmniGen-AF Heifers: IL-4 induced (P < 0.04) by: BHV-1 (D42 & 60) BVDV type 1 (D42) BVDV type 2 (D60) IL-17A induced (P<0.02) by: BVDV type 1 on D60 OmniGen-AF enhanced booster vaccine response Immune System Recognize Respond Restore Healthy Immune Function Herd Health Milk Yield Milk Quality Longevity Sustainability Profitability 20 5
6 What is a healthy cow? Support Immune Function Thank You David Hurley Steve Nickerson 6
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