Emile Bouchard

Emile Bouchard
Université de Montréal | UdeM · Faculty of Veterinary Medicine

DMV, MPVM

About

35
Publications
5,757
Reads
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631
Citations
Citations since 2017
8 Research Items
288 Citations
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201720182019202020212022202301020304050
201720182019202020212022202301020304050
201720182019202020212022202301020304050
Additional affiliations
June 1982 - present
Université de Montréal
Position
  • Professor (Full)

Publications

Publications (35)
Article
Full-text available
Le secteur bioalimentaire est en profonde transformation en raison de l’essor des technologies numériques. Le numérique, les données massives, l’intelligence artificielle (IA) et la robotique sont au cœur même de la révolution en cours. Ces systèmes d’innovation s’inscrivent dans une dynamique de développement des données massives visant à affiner...
Conference Paper
Comme plusieurs autres champs d’activité, le domaine du bioalimentaire est en grande transformation en raison de l’essor des technologies numériques et de l’importance de ces outils pour la productivité et la compétitivité des entreprises ainsi que pour notre autonomie alimentaire. Le numérique, les données massives, l’intelligence artificielle (IA...
Article
The series of events leading to the decision to cull a cow is complex, involving both individual-level and herd-level factors. While the decision is guided by financial returns, it is also influenced by social and psychological factors. Research studies on the motivational and behavioural aspects of farmers’ decision utility are sparse, and nonexis...
Article
Health disorders, such as milk fever, displaced abomasum, or retained placenta, as well as poor reproductive performance, are known risk factors for culling in dairy cows. Clinical mastitis (CM) is one of the most influential culling risk factors. However the culling decision could be based either on the disease status or on the current milk yield,...
Article
The relationship between cows’ health, reproductive performance or disorders and their longevity is well demonstrated in the literature. However these associations at the cow level might not hold true at the herd level, and herd-level variables can modify cow-level outcomes independently of the cows’ characteristics. The interaction between cow-lev...
Article
A retrospective cohort study was conducted using production and health records from Québec dairy herds which were integrated with the objectives of calculating different lifetime profitability measures and developing analyses of the impact of selected reproduction and health variables on profitability. The dataset for the study consisted of lifetim...
Article
Several health disorders, such as milk fever, displaced abomasum, and mastitis, as well as impaired reproductive performance, are known risk factors for the removal of affected cows from a dairy herd. While cow-level risk factors are well documented in the literature, herd-level associations have been less frequently investigated. The objective of...
Article
The objective of this study was to assess the efficacy of cephapirin intrauterine treatment preceding a timed artificial insemination protocol in lactating dairy cows with purulent vaginal discharges (PVDs). Holstein dairy cows (n = 1247) from 18 herds were enrolled in a controlled randomized clinical trial. At 34 days in milk (DIM; ±7 days), cows...
Article
The regulatory limit in Canada for bulk tank somatic cell count (BTSCC) was recently lowered from 500,000 to 400,000 cells/mL. Herd indices based on changes in cow somatic cell count over 2 consecutive months (e.g., proportion of healthy or chronically infected cows, cows cured, and new intramammary infection rate) could be used as predictors for B...
Conference Paper
Abstract Text: Economic values were estimated by regressing profit, adjusted for opportunity cost, up to the end of the 4th lactation on EBVs, using random regressions within herd-year cohort of first calving. Kilograms Fat, kg Protein, milking speed, temperament, rump and conformation all had positive economic values, whereas herd life, angularity...
Article
The objectives of this study were to propose benchmarks for the interpretation of herd udder health using monthly individual somatic cell counts (SCC) from dairy herds in Quebec, Canada and to evaluate the association of risk factors with intramammary infection (IMI) dynamics relative to these benchmarks. The mean and percentiles of indices related...
Conference Paper
Abstract Text: In Quebec, management of dairy herds is affected by various combinations of milking systems (Milk Line, Milking Parlor or Milking Robot), housing systems (Tie-Stall or Free-Stall), and feeding systems (Traditional Feeding, Automatic Forage Distribution, Automatic Concentrate Distribution, Computerized Automatic Concentrate Distribu...
Article
Few studies have investigated the efficacy of extended ceftiofur therapy and none have focused on extended therapy for naturally occurring clinical mastitis. The objective of this study was to compare the efficacy of extended intramammary ceftiofur therapy of 8 d duration with a standard 2-day regimen for the treatment of naturally occurring mild t...
Article
To compare results for 3 commercially available microbiological media plates with those for standard bacteriologic testing of bovine milk. Milk samples from postpartum cows and cows with a high somatic cell count (SCC) or clinical mastitis (CM). Sample-ready Staphylococcus culture medium (SRSC) plates were used to detect Staphylococcus aureus in mi...
Article
Full-text available
This study quantified the effect of peripartum reproductive disorders and parity on repeat breeder status and involuntary culling of dairy cows. Reproductive data of 418 383 lactations were taken from a computerized databank of health records for dairy cows. A logistic regression model was used with dystocia, retained placenta (RP), metritis comple...
Article
Full-text available
Coagulase-negative staphylococci (CNS) are the most prevalent cause of intramammary infections in heifers around calving, but Staphylococcus aureus should not be ignored because it is also prevalent, contagious, and more likely to persist into lactation. The objective of this study was to determine the effect of a subclinical infection caused by S....
Article
The objective of this study was to evaluate the California Mastitis Test (CMT) and a portable electrical conductivity meter for diagnosing precalving intramammary infection (IMI) in Holstein heifers. A total of 428 dairy heifers from 23 dairy herds were enrolled between 6 and 12 days before the expected calving date from June 2002 to June 2003. Mam...
Article
Full-text available
Two-hundred and seventy-three animals were enrolled in a case-case comparison of uterine torsions and other dystocias. The purpose of the study was to describe field cases of uterine torsion and their clinical management, compare them with other types of dystocia attended by field veterinarians, and evaluate the effect of season and housing on the...
Article
Full-text available
A clinical trial was conducted to determine whether prepartum intramammary pirlimycin reduces the proportion of nulliparous heifers with intramammary infection (IMI) during early lactation and improves milk production. Quarter milk samples were collected from 428 heifers, systematically allocated to treatment and control groups, 6 to 12 d before th...
Article
Subclinical mastitis in dairy cows may be detected using various milk screening tests. The individual cow cell count (ICC) is particularly useful because it helps interpretation of epidemiological data received from milk regulators. With ICC, the infectious status of cows compared to a defined level can be evaluated, diagnosis of bacteria as either...
Article
Full-text available
Many studies have reported a decrease in the fertility of dairy cows. This situation is widespread since the studies have originated in regions all over the globe. For example, in the United States, the conception rate at first artificial insemination (AI) has decreased by 0.45% per year over a twenty year period (Butler and Smith, 1989; Beam and B...
Article
Risk factors associated with failure of passive transfer of immunity (FPT) were evaluated among newborn beef calves in Québec. Physical examination was performed on calves born of a normal calving and blood samples were collected for determination of health status and measurement of serum concentration of immunoglobulin (Ig) G1. Of 225 calves, from...
Article
Full-text available
In cows, an average success rate of 32% for artificial insemination is obtained using the ovulation synchronisation GPG protocol in cows. This percentage is similar to that obtained in the same conditions after insemination of observed heat (32.6%) and slightly better to that obtained after synchronisation of heat using one or two doses of PgF 2α (...
Article
A total of 1317 Holstein cows from 45 farms in the Canadian provinces of Quebec, Prince Edward Island (PEI) and Ontario were enrolled in a randomized trial during 1998 and 1999 to further confirm the efficacy of a monensin controlled release capsule in preventing periparturient disease in lactating dairy cows. Cows were randomized on the farms to r...
Article
Full-text available
Questionnaires were mailed to 520 cow-calf producers in Québec in order to compare management practices and herd performance according to herd size (small: < 40 females, or large: > or = 40 females) and in 4 geographic areas for the 1995 calving season. Owners of large herds adopted management practice and preventive measures more often than did ow...
Article
Milk urea nitrogen (MUN), together with percentage milk protein (PROT), are increasingly used as indicators of the protein-energy balance and for monitoring nutrition and diagnosing feeding disorders. The goal of this study was to analyze the effects of parity, milk yield, days in lactation, somatic-cell count, and herd and feeding factors on MUN a...
Article
Full-text available
A retrospective study on 159 cesareans on dairy cows referred between 1985 and 1989 to the veterinary teaching hospital is reported. The objective of the study was to evaluate the probability and the factors associated with survival and subsequent calving. The risk of dying for the cows was 24% following surgery. The risk of dying differed if the c...
Article
Resume Cette etude retrospective porte sur 159 cesariennes pratiquees chez des vaches laitieres referees 'a 'hopi-tal d'enseignement entre 1985 et 1989. Le but de l'etude etait d'evaluer la probabilite et les facteurs associes a la survie et au retour a la production sui-vant la cesarienne. On a note une probabilite de mortalite de 24 % a la suite...

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