According to Simard et al. (2007), plasma
B12 can be considered to be a reliable indicator of the
overall B12 status of sows. In the present experiment,
basal concentrations before gestation (Table 3) were
almost 2 times greater than those reported by Simard
et al. (2007; 126.2 pg/mL for 20 µg/kg of dietary cya-
nocobalamin) with nulliparous sows. Such differences
between studies suggest a parity effect, as has been
reported in previous studies performed during ear-
ly gestation of sows (Guay et al., 2002). Matte et al.
(2006) hypothesized that B12 requirements would be
greater in nulliparous sows, which have dual needs for
reproduction and for growth and development, than in
mature sows, which have needs for only reproduction.
According to Simard et al. (2007), plasma B12 can be considered to be a reliable indicator of the overall B12 status of sows. In the present experiment, basal concentrations before gestation (Table 3) were almost 2 times greater than those reported by Simard et al. (2007; 126.2 pg/mL for 20 µg/kg of dietary cya-nocobalamin) with nulliparous sows. Such differences between studies suggest a parity effect, as has been reported in previous studies performed during ear-ly gestation of sows (Guay et al., 2002). Matte et al. (2006) hypothesized that B12 requirements would be greater in nulliparous sows, which have dual needs for reproduction and for growth and development, than in mature sows, which have needs for only reproduction.
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