ANBI 470.3 Lecture Notes - Lecture 9: Duodenum, Feedlot, Independent Community And Health Concern
20 Jun 2018
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Animal health issues:
-Canada rejects rbST on animal health issues
-Expert panel of the CVMA find rbST dramatically increases reproductive problems, mastitis and
lameness
-Based on scientific data submitted by Monsanto including studies conducted by the company
and some independent studies
-Most studies at time were full lactation (got rbST the day she calved and continued through
lactation)
Reproduction:
-Slight increase in days open (takes longer for animal to return to estrus) and substantial risk of
non-pregnancy (animal do not conceive on first breeding or at all)
-Inconclusive results on cystic ovaries, abortion, and twinning (all of these things are present at
low percent so difficult to say it was not just biological variation)
-Most solved by treating after confirmed pregnancy (not giving rbST till after pregnant)
Lameness:
-suggest 50% increase in incidence
-suggest management not able to reduce this
-related to high energy/protein dense diets (lameness associated with reformulating diets to
support elevated milk production, the energy density of the diet is released to rumen function
and rumen wall that can lead to lameness in the hooves)
Mastitis:
-suggest 25% increase in risk of clinical mastitis and increase sub-clinical (somatic cell count)
-current management practice could reduce ( but still high change of occurring)
-specifically rejected Monsanto argument that increased mastitis was because cows produced
more milk; not due to rbST
Monsanto counter argument (to which FDA agreed)
-reproductive problems are related to increased milk yield
osame as response to gentic improvement
ocommercial use/recommendation is to treat post conception
-lameness problem but not significant
oricher diet formulation required to support higher milk yyeild is associated with higher
lameness (again not due to rbST)
-mastitis increase minor
oproduction related
owhen compared against other factors impacting mastitis incidence
oGH increase immune function
Much of the negative effects are considered related to higher milk production where genetically
superior high producing cows which are not bST treated show similar increased incidence of health
problems
FDA agreed to more productive cows but said you must submit a post approval monitoring program:
had a hotline to report problems as well
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