Lecture 5: Dairy 1- Can Diseases and Health Management Flashcards
- What is perinatal mortality? 2. What are potential causes? 3. Who are more susceptible?
- A calf carried to term (260d min) is born dead or dying within 24-48h of birth.
- Related to dystocia (abnormal calving), anoxia (Inability to get O2), congenital issues (born with)
- More common in first time calvers (bc pelvis is smaller)
- What is dystocia? 2. What factors cause it?
- Difficult or abnormal calving (70min average anything longer = dystocia.)
- -Feto-pelvic disproportion (most common when fetus is larger then the pelvic canal of the dam)
-Breed (Holstein is higher risk bc genetics)
-Calf presentation (how calf is coming out superman=normal head 2 hooves)
-Insufficient dilation if cervix
-Uterine torsion (uterus twists which causes calf to get suck and can pull)
TRUE OR FALSE: There are only short term impacts of dystocia.
FALSE.
There are many different impacts of dystocia, internal, impaired breathing and thermoregulation, can’t get enough O2 ie hypoxia.
There are short term AND long term affects for dystocia.
Short term- Mortality, failed transfer of passive immunity
Long term- Reduced milk production
How can we prevent dystocia for the cow?
-Breeding/genetics- selecting a bull with good calving ease
-Nutrition- fat can go to pelvic area if obese and block opening
-Observation- watch close to calving check every 30 mins
-Appropriate intervention- use of chains and not pulling too hard
How can we prevent dystocia for the calf?
-Respiratory and thermal support
-Non-sterodial anti-inflammatory
-Manual feeding of colostrum
What is colostrum and why is it so important?
-First milk after calving
-Produced by the dam during 5 weeks before calving
-“liquid gold” for calves
-High in protective antibodies (IgG)
-Large # of calories and other nutrients
- What is passive immunity? 2. Why do calves need it?
- Absorption of maternal immunogolbin from colostrum after birth in small intestine of calf
- The placenta if cow separates serial blood supply, calf relies absorption of material Ig from colostrum
What are 4 components of Colostrum Management?
-Cleanliness
-Quickness
-Quantity
-Quality
What are important concepts in the quality component of colostrum management?
-Variable quality (IgG content) each cow is different
-Affected by vaccination (5w before calving), breed (Holstein worst), age (older more younger less bc exposed to less), nutrition of dam(sufficient energy), heat stress(cool them so they don’t waste energy), leaking(decrease quality), cleanliness of harvest.
-Colostrum can be tested for quality (specific gravity of colostrum), high quality colostrum= IgG >50g/L
What are important concepts in the quantity component of colostrum management?
-Deliver and absorb immunoglobulin (Ig) to protect against disease
-Target = 10g/L IgG in bood serum (at 7d) total protein=>5.2g/dL
-Need to deliver > or = 100g IgG (150-200g IgG is better)
-Based on typical Holstein colostrum [IgG] the calf must ingest~10-12% of their body weight in colostrum during the first feeding (4L for Holstein and 3L for Jerseys)
What are important concepts in the quickness component of colostrum management?
-IgG in rumen only functional for the first 24h of life, therefore absorption declines over 24h and highest immediately after calving
-Colostrum delivered to the calf later after birth reduced intestinal Ig absorption capacity
-IgG is reabsorbed back into the mother if not used
What are important concepts in the cleaness component of colostrum management?
-Bad Bacteria in colostrum interfere with passive absorption of colostrum
-If bacteria is bad will cause it to bind molecules that are too big to be absorbed
What are alternatives to fresh colostrum?
-Refrigerated colostrum- up to 48h after will grow bacteria
-Frozen colostrum- up to 1yr- as long as constantly frozen
-Colostrum replacer- Absorption of IgG is less with replacers. 2 packages (200 g IgG). Therefore feed higher levels to make sure animal is getting enough
What are colostrum feeding strategies?
- Esophageal tube feeder
- Nipple bottle
- Suckle from the dam
1 and 2 no difference between them (whatever works faster on farm)
3 no idea how much Is getting into calf and increase in bacterial diseases.
What are places that contamination can occur? Which one is the most common?
-Udder: make sure to clean before milking
-Collection bucket: If left out increase in bacteria and can touch other cows etc
-Storage: Make sure feeding right away or storing correctly
-Feeding equipment: Cleaning nipples, bottles and tube feeders correctly