Levantamento do manejo de bovinos leiteiros recém-nascidos: desempenho e aquisição de proteção passiva

Neto, Raul Machado; Faroni, Carlos Eduardo; Pauletti, Patrícia Mendonça; Bessi, Rosana

doi:10.1590/s1516-35982004000900019

Cited by 17 publications

(15 citation statements)

References 9 publications

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“…As regards the data from Brazilian systems, there is a scarcity of studies that characterize the production of dairy calves; in the literature, only one study focused on issues related to colostrum feeding, but in a specific state of Brazil (Machado Neto et al, 2004). Despite the wealth of information, the study did not reveal more detailed information about the production of dairy calves considering dry cows and weaning.…”

Section: Introductionmentioning

confidence: 99%

“…In several countries, some studies have already been conducted to understand how producers raise replacement animals (Machado Neto et al, 2004;Kehoe et al, 2007;Vasseur et al, 2010;Walker et al, 2012). Through these studies, it was possible to provide information on handling regarding the feeding and health management of the calves, all of which contribute to a reduction in the animal mortality and morbidity rates.…”

Section: Introductionmentioning

confidence: 99%

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A survey of dairy calf management practices in some producing regions in Brazil

Santos

Bittar

2015

R. Bras. Zootec.

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-This study aimed to characterize the Brazilian dairy calves raising systems through a survey of major aspects of animal husbandry. One hundred seventy-nine producers and/or technicians were interviewed. The questionnaire addressed issues related to the management of the dry cow and the newborn, nutritional management of the liquid-feeding phase, housing, and health management. A third of newborn calves stay with their mothers for more than 24 h after delivery, and only 56% of the calves receive colostrum within the first 8 h of life. Four out of ten producers allow the calf to suckle colostrum directly from the mother. Regarding the liquid diet, 44 and 35% of the farms provide marketable milk and discard milk for the calves, respectively. It was possible to identify several areas of improvement in the raising system; for instance, greater attention could be given to dry cows and the monitoring of births and to the establishment of adequate protocols to evaluate colostrum quality and feeding management.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A survey of dairy calf management practices in some producing regions in Brazil

Santos

Bittar

2015

R. Bras. Zootec.

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“…Previous studies have attempted to understand how farmers rear replacement animals in some regions of Brazil (HÖTZEL et al, 2014;MACHADO NETO et al, 2004;BITTAR, 2015). However, despite the extensive participation of family farms in the milk production in Minas Gerais, the practices adopted by these farmers in the pre-and post-weaning phases of bovine females are little known.…”

Section: Introductionmentioning

confidence: 99%

Characterization of the factors associated with the growth phase of dairy cattle in family farming

Ferrazza

Moura

Lopes

2018

SCA

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The aim of this study was to characterize the factors associated with the growth phase of dairy cattle used in family farming. We investigated 20 family-run milk production systems located in the Conceição de Ipanema municipality, MG, Brazil. Farmers were interviewed using a semi-structured survey form containing 152 questions. The questions were aimed at characterizing the farmer, herd, and husbandry system at pre-and post-weaning phases. Data were processed by using Sphinx ® software, and descriptive analyses were performed in MS Excel ® software. The results showed strengths, including navel healing (100%), location of the calf housing above (45%) or next to the pen (35%), and existence of a sanitary calendar (90%). However, several limitations in the management of calves and heifers were identified, such as lack of zootechnical bookkeeping (55%), manual milking with calf at the foot (65%), absence of herd sizing (100%), no routine weighing of calves (95%), incorrect colostrum management (80%), non-supply of transition milk to calves (85%), and likely failure to diagnose diseases by a fraction of the farmers. Thus, training regarding adequate management practices by extension technicians is imperative, along with the formulation of public policies that comply with the aspirations of family farmers, while promoting their economic and social sustainability.

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“…The type of calf housing system was also related to mortality and diarrhea in newborn calves (BOTTEON et al, 2008;MACHADO NETO et al, 2004). In Brazil, to minimize the health problems related to calf housing systems, some dairy farms use individual outdoor calf hutches, which have several advantages, such as protection against excessive rain and sun, ease of cleaning and movement, and the avoidance of moisture accumulation (OLIVEIRA et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Risk factors for diarrhea in a cohort of dairy heifer calves reared in individual outdoor hutches in Piraí, Rio de Janeiro, Brazil

Fagundes

Vidal

Alves³

et al. 2016

SCA

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This study aimed to evaluate the association between diarrhea and risk factors potentially related to diarrhea incidence, such as Cryptosporidium, Giardia, Eimeria and nematode infection, animal age, failure to transfer passive immunity, type of fertilization (artificial insemination - AI, in vitro production of embryos - IVP and natural breeding), mother (heifer/cow) and birth weight of heifer calves reared in individual outdoor hutches on a dairy farm. The database used in the present study refers to a weekly survey of a cohort of 118 heifer calves from birth to 100 days of age. A logistic generalized additive model (GAM) was fit to evaluate the functional relationship between the risk of diarrhea occurrence and birth weight. For analysis purposes, the database was divided into calves up to 30 days old and calves 31 to 100 days old. Bivariate and multivariate analyses were performed using logistic regression models via generalized estimating equations. All variables were included in the models and were removed oneby-one according to Wald statistics to obtain the final model. The relative risks (RR) and their respective 90% confidence intervals were estimated. The final model for calves up to 30 days old showed that IVP [RR=0.33 (90% CI 0.14; 0.75)] is a protective factor and that Cryptosporidium spp. infection [RR=1.95 (90% CI 1.22; 3.12)] is a risk factor. Although not statistically significant [RR=1.46 (90% CI 0.98; 2.18)], failure to transfer passive immunity increases the risk of diarrhea. The final model for calves 31 - 100 days old showed that IVP [RR=0.50 (90% IC 0.28; 0.89)] and birth weight ? 40 kg [RR=0.65 (90% CI 0.47; 0.89)] are protective factors. In this age group, Cryptosporidium spp. infection has no statistical significance [RR=1.25 (90% CI 0.95; 1.64)]. These results indicate that some of the diarrhea episodes observed in animals up to 30 days old could be explained by Cryptosporidium infection; therefore, better monitoring of these animals is recommended. Greater care in colostrum administration is suggested because animals with hypoglobulinemia are more sensitive to diarrhea occurrence. Although attention should be given to all animals with a low birth weight, special care should be given to those 31 to 100 days old.

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Levantamento do manejo de bovinos leiteiros recém-nascidos: desempenho e aquisição de proteção passiva

Cited by 17 publications

References 9 publications

A survey of dairy calf management practices in some producing regions in Brazil

A survey of dairy calf management practices in some producing regions in Brazil

Characterization of the factors associated with the growth phase of dairy cattle in family farming

Risk factors for diarrhea in a cohort of dairy heifer calves reared in individual outdoor hutches in Piraí, Rio de Janeiro, Brazil

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