Effect of dry period length on NEFA and IGF-I plasma concentrations and postpartum ovarian activity resumption in dairy cows
Contributo in Atti di convegno
Data di Pubblicazione:
2012
Citazione:
Effect of dry period length on NEFA and IGF-I plasma concentrations and postpartum ovarian activity resumption in dairy cows / M. Probo, A. Comin, A. Agazzi, I. De Amicis, A. Prandi, F. Cairoli - In: Veterinary Science : current aspects in biology, animal pathology, clinic and food hygiene / [a cura di] A. Pugliese, A. Gaiti, C. Boiti. - Berlin : Springer Verlag, 2012. - ISBN 978-3-642-23270-1. - pp. 21-25 (( Intervento presentato al 64. convegno Convegno nazionale SISVet tenutosi a Asti nel 2010 [10.1007/978-3-642-23271-8_4].
Abstract:
The current study was carried out to examine the effects of dry period duration on NEFA and IGF-I plasma
concentrations and postpartum ovarian activity resumption in dairy cows. Twenty-five pregnant Friesian
cows (second and third lactation) were randomly assigned to one (standard dry period, 9 weeks, group C, n
= 12) of two (short dry period, 5 weeks, group T, n = 13) treatments. Blood samples for NEFA and IGF-I
analyses were collected once a week during the last 5 weeks prepartum and the first 14 weeks of lactation.
Milk whey collection (twice/week) for progesterone analysis began 2 weeks after parturition and was used
to detect ovarian activity resumption (at least three consecutive samples with P4 # 300 pg/mL). The data
obtained were analyzed by ANOVA for repeated data (mixed) and GLM of the SAS statistical package.
Short dry periods reduced milk production (26.55 vs. 27.55 kg/day; P # 0.01), without modifying milk
quality. The mean interval from calving to first postpartum cycle was shorter in group T than in group C
(34.5 vs. 46.9 days, P # 0.01). No differences were found in NEFA plasma concentrations between groups
either before or after calving, while IGF-I circulating concentrations were higher in group T than in group
C during both the dry period and the first 14 weeks of lactation (P # 0.01). In conclusion, the reduction in
the dry period had a positive impact on metabolic balance and time of postpartum resumption of ovarian
activity.
Tipologia IRIS:
03 - Contributo in volume
Keywords:
Dairy cow ; dry period ; IGF-I ; NEFA ; ovarian activity
Elenco autori:
M. Probo, A. Comin, A. Agazzi, I. De Amicis, A. Prandi, F. Cairoli
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Titolo del libro:
Veterinary Science : current aspects in biology, animal pathology, clinic and food hygiene