The effect of group size on health and growth rate of Swedish dairy calves housed in pens with automatic milk-feeders

Svensson, C.; Liberg, Per

doi:10.1016/j.prevetmed.2005.08.021

Cited by 154 publications

(164 citation statements)

References 12 publications

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“…However, the system can increase the risk of clinical respiratory-tract disease and even reduce growth rate (Svensson et al, 2003. Stable groups of no more than eight calves seem preferable from an animal health perspective (Svensson and Liberg, 2006;Engelbrecht Pedersen et al, 2009). As pointed out by Barkema et al (2015), it may be difficult to achieve small and stable calf groups in practice, especially at small farms.…”

Section: Disruption Of Social Structuresmentioning

confidence: 99%

Key issues in the welfare of dairy cattle

Hultgren¹

2017

Burleigh Dodds Series in Agricultural Science

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Section: Disruption Of Social Structuresmentioning

confidence: 99%

Key issues in the welfare of dairy cattle

Hultgren¹

2017

Burleigh Dodds Series in Agricultural Science

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“…Infectious diseases are often considered as the principal cause of calf mortality, specially gastro-intestinal disorders (Svensson and Liberg, 2006;Torsein et al, 2011;Bähler et al, 2012;Daros et al, 2014) and respiratory problems (Gulliksen et al, 2009). Moreover, farms with high calf mortality are regarded as of having poor welfare at the farm level (Ortiz-Pelaez et al, 2008;Kelly, 2013).…”

Section: Advances In Animal and Veterinary Sciencesmentioning

confidence: 99%

Survey of Calf Management and Hygiene Practices Adopted in Commercial Dairy Farms in Chittagong, Bangladesh

Chowdhury¹,

Barua²,

Rakib³

et al. 2017

Adv. Anim. Vet. Sci.

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IntroductIon Livestock is an inherent element of the compound farming system in Bangladesh as it besides a source of meat and milk protein, a prime source of farm power services as well as employment. The livestock sub-sector dispenses 20% and 50% of the total population a full time employment and part-time employment, respectively. The contribution of the livestock sector to total gross domestic product persisted steady within a range of 2.1-3.6% over the 1973-2008 periods. Despite a steady contribution to the Gross Domestic Product (GDP), budget allocation for this sector remained <1% of the total expenditure. Moreover, it was revealed that the growth in individual livestock products were mainly in minor products (e.g., tails, bones, etc.) and hides and skins (a major export item) rather than in milk and milk products, meat and eggs might not be very motivating because such tendency will lead to less imresearch Article Abstract | A survey was conducted to characterize calf management and hygiene practices adopted by dairy farmers at Chittagong, in Bangladesh. A total of 210 dairy farms located in 3 geographically distinct regions in Chittagong division, namely coastal, hilly and plain area, were surveyed. Calf management and hygiene practice related data was collected through a standard questionnaire and all sampled farms were visited once by technical persons and administered the questionnaire by 'face to face' method during the period July, 2015 to May, 2016. Statistically significant variations were observed in distribution of different factors through different strata (herd size and region). Among larger farms (>50 cows), 10% had a poor hygiene score whereas 32% of the smaller farms (5-20 cows) belonged to this category. 97% of the large farms used tube well water as the source of drinking water for their calves; whereas 35% of the small farms used surface water. None of the large and medium farm owner said they never clean the calf pen; 47% small farm owners said yes to it. More than half of the smallholders (54%) were discovered with raising other domestic animals and birds within the same premises. Hygiene score and surrounding environment of the farms did not show any regional variation (p>0.05). Remarkably 65% farms of the hilly area used surface water for their calves to drink with. The relationship between management practices and calf mortality/morbidity is complex. Our study design did not allow us to draw conclusions about the management and hygiene practice responsible for calf mortality/morbidity, but knowing the management practices adopted on farms is valuable for bringing attention to herds with less optimal practices and for planning meaningful experiments to explore causal affects.

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“…A maior concentração de animais com idades e níveis imunológicos diferentes no mesmo lote pode favorecer a instalação e disseminação de agentes patogênicos entre os animais, como descrito por Callan & Garry (2002), Svensson & Liberg (2006)ou proporcionar uma condição de risco para broncopneumonia como descrito por Gonçalves et al (2011), resultando em maior resposta imunológica, sem caracterizar uma doença respiratória, quando analisado juntamente aos parâmetros do exame físico geral, que se encontraram dentro dos limites fisiológicos.…”

Section: Quadro 2 Contagem Diferencial De Células Do Lavado Broncoalunclassified

Perfil citológico pulmonar de bezerros sadios nos três primeiros meses de vida

et al. 2016

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RESUMO.-A citologia é um importante exame complementar utilizado para a detecção de alterações no perfil celular do trato respiratório e auxílio no diagnóstico de doenças. No entanto, como os primeiros meses de vida compõem o período de adaptação à vida extrauterina resultando em possíveis alterações das populações celulares, é essencial a padronização das características comuns aos animais sadios, possibilitando a identificação e análise de qualquer mudança no quadro esperado. O objetivo desta pesquisa foi caracterizar o perfil celular por citologia do lavado broncoalveolar obtido semanalmente por broncoscopia de dez bezerros durante os três primeiros meses de vida. A análise estatística foi realizada utilizando-se o software Minitab ® 15.0, empregando-se o teste T pareado para as amostras paramétricas e Mann-Whitney para as amostras não paramétricas, considerando nivel de significância P≤0,05. Os resultados obtidos apontaram que o perfil celular do lavado broncoalveolar de bezerros hígidos durante os primeiros 90 dias de vida apresentou predomínio de macrófagos, com média geral de 63,17%, seguido de 33,69% de neutrófilos. Porém observou-se diminuição significativa na porcentagem de macrófagos (P=0,04) e aumento de neutrófilos Cytology is an important supplementary test used for the detection of changes in the mobile profile of the respiratory tract and aid in the diagnosis of diseases. However, as the first few months of life make up the period of adjustment to extrauterine life resulting in possible changes in cellular populations, it is essential to the standardization of the characteristics common to healthy animals, enabling the identification and analysis of any change in the expected frame. The objective of this research was to characterize the cellular profile by cytology of bronchoalveolar lavage obtained weekly for bronchoscopy of ten calves during the first three months of life. Statistical analysis was performed using the Minitab ® 15.0 software, using the paired T test for parametric samples, and Mann-Whitney for nonparametric samples, considering significance level as P≤0,05. The results obtained showed that the profile of bronchoalveolar lavage of healthy calves during the first 90 days of life showed a predominance of macrophages, with medium average of 63.17%, followed by 33.69% neutrophils. However it was observed significant decrease in percentage of macrophages (P=0.04) and increased neutrophils (P=0,05) over the times, proven by the strong negative correlation between percentages of macrophages and neutrophils along the times. There was no difference between the percentages of giant cells, epithelial cells, lymphocytes, eosinophils and basophils during the experiment. Although the results are influenced by environmental factors and management, the results of this research provide subsidies for the identification of critical changes in cell profile of calves affected by respiratory diseases.INDEX TERMS: Cattle, calf, respiratory disease, bronchoalveolar lavage, bronchoscopy.

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The effect of group size on health and growth rate of Swedish dairy calves housed in pens with automatic milk-feeders

Cited by 154 publications

References 12 publications

Key issues in the welfare of dairy cattle

Key issues in the welfare of dairy cattle

Survey of Calf Management and Hygiene Practices Adopted in Commercial Dairy Farms in Chittagong, Bangladesh

Perfil citológico pulmonar de bezerros sadios nos três primeiros meses de vida

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