2003
DOI: 10.1590/s0102-09352003000100001
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Abstract: Seventy-five Angus x MARC II crossbred heifers were used to assess the effects of age at weaning on calf performance and blood constituents. Calves were weaned at 150, 210, or 270 days of age with comparisons made to their non-weaned counterparts. Changes in blood chemistry and hematology (cortisol, glucose, T3, total proteins, packed cell volume and the differential white blood cell count) were recorded on the day of weaning (day-0), and at 2, 7, 14, and 28 days post-weaning. Calves weaned at 210 days of age … Show more

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Cited by 11 publications
(11 citation statements)
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“…These changes in leucocyte population are associated with acute stress (Duncan and Prasse, 1986;Fell et al, 1999) and may increase the susceptibility to disease and reflect a reduced capacity of calves to cope with stressors of the feedlot environment. However, no differences were found due to age at weaning, confirming the results reported by Smith et al (2003) and Bueno et al (2003). On the contrary, age at weaning affected cellular-mediated immune responses in calves weaned at 5, 9 and 13 weeks of age (Pollock et al, 1993).…”
Section: Discussionsupporting
confidence: 87%
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“…These changes in leucocyte population are associated with acute stress (Duncan and Prasse, 1986;Fell et al, 1999) and may increase the susceptibility to disease and reflect a reduced capacity of calves to cope with stressors of the feedlot environment. However, no differences were found due to age at weaning, confirming the results reported by Smith et al (2003) and Bueno et al (2003). On the contrary, age at weaning affected cellular-mediated immune responses in calves weaned at 5, 9 and 13 weeks of age (Pollock et al, 1993).…”
Section: Discussionsupporting
confidence: 87%
“…In the current study, fibrinogen concentrations showed higher baseline values in calves weaned at 150 days than those weaned at 90 days of age. This result could be due to the fact that plasma total proteins in cattle increase with age (Bueno et al, 2003). On the other hand, similar to the results reported in calves weaned at 7 and 8 months (Phillips et al, 1989;Hickey et al, 2003), fibrinogen concentration of TW calves was elevated at 48 h and declined at 168 h compared to pre-weaning values.…”
Section: Discussionsupporting
confidence: 84%
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“…Although weaning allows to improve reproductive results, it triggers a stress response in calves (Bueno et al, 2003;Blanco et al, 2009;Enríquez et al, 2010) and cows (Lefcourt and Elsasser, 1995;Haley, 2006), affecting the welfare of both members of the dyad. The cow-calf bond is established since birth and it is maintained throughout nursing (Hudson and Mullord, 1977).…”
Section: Introductionmentioning
confidence: 99%