Cow- and herd-level risk factors for lameness in partly housed pasture-based dairy cows

The aim of this study was to investigate whether season, lactation number, breed standard and milk production were risk factors relating to occurrences of gastrointestinal nematodes in dairy cows during the peripartum period. Eighty-four cows were randomly selected through proportional stratified sampling. In order to analyze the fecal egg per gram (EPG) count, the data were subjected to the Spearman test, Kruskal-Wallis test at 5% significance and linear regression. At the time of calving, the cows showed high EPG counts in relation to all variables analyzed. Among the animals studied, we observed that purebred Holstein cows at their first lactation and with high milk production showed high EPG counts (600) and comprised the group most at risk within the herd studied. In this group, the animals showed moderate EPG during the prepartum period (300) and a significant increase (p < 0.01) in EPG count from the time of calving (900), i.e. an increase of the order of 300%. Selection of animals for milk production in tropical countries should be based not only on productive potential, but also on adaptive features.

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Large-scale study of herd-level risk factors for bovine brucellosis in Brazil

Acta Tropica ◽

10.1016/j.actatropica.2016.09.016 ◽

2016 ◽

Vol 164 ◽

pp. 226-232 ◽

Cited By ~ 11

Author(s):

Ana Lourdes Arrais de Alencar Mota ◽

Fernando Ferreira ◽

José Soares Ferreira Neto ◽

Ricardo Augusto Dias ◽

Marcos Amaku ◽

...

Keyword(s):

Risk Factors ◽

Large Scale ◽

Bovine Brucellosis ◽

Herd Level ◽

Large Scale Study

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Prevalence and risk factors of mastitis in dairy cows

Bangladesh Veterinarian ◽

10.3329/bvet.v26i2.4951 ◽

1970 ◽

Vol 26 (2) ◽

pp. 54-60 ◽

Cited By ~ 13

Author(s):

MA Rahman ◽

MMU Bhuiyan ◽

MM Kamal ◽

M Shamsuddin

Keyword(s):

Risk Factors ◽

Dairy Cows ◽

Dairy Farms ◽

Clinical Mastitis ◽

Dry Season ◽

The Other ◽

Wet Season ◽

Lactating Cows ◽

California Mastitis Test ◽

Control Programmes

Identification of risk factors is important for the design of control programmes for mastitis in cows. Information about farms and management was collected at a farm visit. California Mastitis Test (CMT) was performed to assess sub-clinical mastitis, and cows, udder and milk were examined for clinical mastitis. A total of 347 lactating cows from 83 farms in the dry season (November - February) and 388 lactating cows from 89 farms in the wet season (June - October) were studied. The overall prevalence of mastitis was 19.9% and 44.8% in dry and wet seasons, respectively. The prevalence of mild mastitis was 17.3% and 40.7%, whereas that of moderate mastitis was 2.6% and 4.1% in dry and wet seasons, respectively. The prevalence of mastitis was higher (P<0.01) in wet than in dry season. On average, 18.7% quarters had mastitis during the wet season and 6.9% in the dry season. In the dry and wet seasons, respectively, 63.9% and 11.2% had completely dry floors, and the prevalence of mastitis was 22.6% and 30.0%. On the other hand, 88.8% and 36.1% of 83 farms had partly or completely wet and soiled floor and the prevalence of mastitis was 40.0% and 59.5% in the dry and wet seasons, respectively. Udder cleanliness, milk yield and peri-parturient diseases significantly (P<0.01) increased the risk of mastitis. The prevalence of mastitis is regarded as quite high. Dry and clean floor to keep cow's udder and teat clean would help control mastitis in the dairy farms of Bangladesh. DOI: 10.3329/bvet.v26i2.4951 Bangl. vet. 2009. Vol. 26, No. 2, 54-60

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Prevalence and herd-level risk factors of bovine tuberculosis in the State of Goiás, Brazil

Semina Ciências Agrárias ◽

10.5433/1679-0359.2016v37n5supl2p3625 ◽

2016 ◽

Vol 37 (5Supl2) ◽

pp. 3625 ◽

Cited By ~ 1

Author(s):

Willian Vilela Rocha ◽

Valéria De Sá Jayme ◽

Ana Lourdes Arrais de Alencar Mota ◽

Wilia Marta Elsner Diederichsen de Brito ◽

Glauciane Ribeiro de Castro Pires ◽

...

Keyword(s):

Risk Factors ◽

Bovine Tuberculosis ◽

Protective Factor ◽

Management Practices ◽

Multiple Logistic Regression Analysis ◽

Livestock Production ◽

The State ◽

Economic Losses ◽

Strong Concentration ◽

Herd Level

Bovine tuberculosis results in economic losses in livestock production and poses a risk to public health. This study aimed to characterize the epidemiological status of bovine tuberculosis in adult cows in the state of Goiás, Brazil. The state was divided into three sampling strata, corresponding to different livestock production circuits. A total of 18,659 animals were tested with the comparative cervical tuberculin test (CCT), in 300 randomly sampled bovine herds per stratum. An epidemiological questionnaire was used to identify health and management practices that may be associated with the presence of tuberculosis infection in the herd. In Stratum 1, dominated by beef cattle, no animals reacted to the CCT. In Stratum 2, which covers the main dairy regions of the state, the prevalence was estimated at 8.67% [5.73 to 12.74%] for herds and at 0.9% [0.21 to 1.58%] for animals. In Stratum 3, characterized by a mix of dairy, beef and dual-purpose herds, the prevalence was estimated at 1.00% [0.21 to 2.89] for herds and 0.30% [0.10 to 0.49 %] for animals. The overall prevalence in the state of Goiás was 3.43% [2.20 to 4.67%] for herds and 0.30% [0.10 to 0.49%] for animals. The multiple logistic regression analysis revealed that herd-level risk factors associated with the presence of the bovine tuberculosis are: the location of the herd in Stratum 2 (OR = 12.05 [3.52 to 41.28]) and the number of times a cow is milked per day (OR = 6.27 [2.72 to 14.44]). Regular veterinary care was identified as a protective factor (OR = 0.38 [0.15-0.94]). These results indicate that bovine tuberculosis is endemic in the state; its spatial distribution is heterogeneous with a strong concentration in dairy regions. The most intensive dairy farms are those with the highest risk, which is consistent with what other authors’ found elsewhere in Brazil. The epidemiological information generated by this study provides information for planning of risk-based surveillance actions, and justifies the adoption of free-herd certification programs for bovine tuberculosis in the main dairy regions of Goiás.

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