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Production and composition of Iberian sow's milk and use of milk nutrients by the suckling Iberian piglet

Published online by Cambridge University Press:  05 April 2011

M. A. Aguinaga ,
F. Gómez-Carballar ,
R. Nieto  and
J. F. Aguilera
M. A. Aguinaga
Affiliation:
Instituto de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Cno. del Jueves s/n, 18100 Armilla, Granada, Spain
F. Gómez-Carballar
Affiliation:
Sánchez Romero Carvajal Jabugo S.A., Avda de Jerez s/n, 41012, Sevilla, Spain
R. Nieto
Affiliation:
Instituto de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Cno. del Jueves s/n, 18100 Armilla, Granada, Spain
J. F. Aguilera*
Affiliation:
Instituto de Nutrición Animal, Estación Experimental del Zaidín (CSIC), Cno. del Jueves s/n, 18100 Armilla, Granada, Spain
*
†E-mail: [email protected]
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Abstract

Sixteen purebred Iberian (IB) sows were used in two consecutive trials to determine the efficiency of conversion of sow's milk into piglet body weight (BW) gain and the relationship between milk protein and body protein retention and between milk energy yield and body energy retention in the nursing IB piglet. In each trial, four sows were selected in order to evaluate their milk production, litter growth and nutrient balance measurements, together with four additional sows for milk sampling. Litter size was equalized to six piglets. Daily milk yield (MY) was determined weekly by the weigh-suckle-weigh technique over a 34-day lactation period. Piglets were weighed individually at birth and then weekly from day 5 of lactation. Milk samples were collected on days 5, 12, 19, 26 and 34 post partum. The comparative slaughter procedure was used to determine piglet nutrient and energy retention. One piglet from each litter was slaughtered at birth and four on the morning of day 35. Total MY was on average 5.175 ± 0.157 kg/day. The average chemical composition (g/kg) of the milk was 179 ± 4 dry matter, 53.4 ± 1.0 CP, 58.5 ± 3.8 fat, 10.4 ± 0.3 ash and 56.9 ± 2.3 lactose. Milk gross energy (GE) was 4.626 ± 0.145 MJ/kg. Milk intake per piglet tended to increase in trial 2 (832 v. 893 g/day; P = 0.066). Piglet BW gain contained (g/kg) 172.1 ± 1.3 protein, 151.5 ± 3.5 fat, 41.4 ± 0.6 ash and 635 ± 3 water and 10.127 ± 0.126 MJ GE/kg. Throughout the 34-day nursing period, the piglets grew at an average rate of 168 ± 3 g/day. The ratio of daily piglet BW gain to daily MY was 0.195 ± 0.002 g/g and the gain per MJ milk GE intake was 41.9 ± 0.5 g/MJ. The overall efficiency of protein accretion (g CP gain/g CP milk intake) was low and declined in trial 2 (0.619 v. 0.571; P = 0.016). Nutrient and energy deposition between birth and weaning were 27.4 ± 0.5 g/day protein, 24.2 ± 0.8 g/day fat and 1615 ± 40 kJ/day energy. Piglet energy requirements for maintenance were 404 kJ metabolizable energy (ME)/kg BW0.75. ME was used for growth with a net efficiency of 0.584. These results suggest that poor efficiency in the use of sow's milk nutrients rather than a shortage in milk nutrient supply might explain the low growth rate of the suckling IB piglet.

Keywords

milk productionmilk compositionIberian pigletsprotein and energy depositionnutrient balance
Type
Full Paper
Information
animal , Volume 5 , Issue 9 , 05 August 2011 , pp. 1390 - 1397
Copyright
Copyright © The Animal Consortium 2011

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