POPM 4230 Lecture Notes - Lecture 4: Dairy Cattle, Perinatal Mortality, Colostrum

• School: University of Guelph
• Department: Population Medicine
• Course: POPM 4230
• Professor: Terri O' Sullivan

Document Summary

Mastitis is the (cid:373)ost (cid:272)ostly disease fo(cid:396) the dai(cid:396)y i(cid:374)dust(cid:396)y u(cid:374)less you (cid:449)o(cid:396)k o(cid:374) la(cid:373)e(cid:374)ess (cid:396)ep(cid:396)odu(cid:272)tio(cid:374) Mastitis o(cid:374)e (cid:449)o(cid:396)d (cid:373)a(cid:374)y diseases: 130+ different organisms, bacteria, protozoa, algae. Two mostly independent forms: clinical and subclinical, contagious and environmental. Typically, 1 cow in 5 have >1 case of clinical mastitis per lactation. Often the most economically important disease on a dairy farm (~- per case: ~- per 100 cows per year. The #1 reason for use of antibiotics in dairy cows. Agent: bacterial pathogens in sufficient numbers. Environment: teat hygiene, cleanliness of stalls, alleys. Prevention is based on understanding how disease happens. Disease only occurs if sufficient causal factors are present. Changes in milk and udder: severe. Subclinical mastitis: absence of other diseases, teat end health, cows, heat stress, humidity, visibly normal milk but measurable infection or inflammation (elevated scc) Many mastitis-causing organisms are common on the cow and in her environment.