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Effect of Dietary Protein Sequence on Long-Term Sow Reproductive Performance^{1 ,2,}

The Ohio Agricultural Research and Development Center, Wooster 44691, The Ohio State University, Columbus 43210

Abstract

An experiment was conducted at two locations with 75 crossbred animals for three parities to evaluate sow reproductive performance as influenced by three dietary protein regimens. Diets fed contained either a 9/18%, 12/16% or a 14/14% protein sequence for the gestation/lactation periods, respectively. The diets were formulated by altering the ratio of corn to soybean meal to achieve the desired protein concentration. Diets were fed daily at 1.82 kg during gestation and at ad libitum levels during lactation following an adjustment period. Sow gestation weight gains were lower when the 9% protein diet was provided for parities I and II. All sow groups gained weight during lactation with gains inverse to those attained during gestation. Feed intakes during lactation were similar for all treatment groups. There was a trend toward a lower number of pigs born (total and live) when the 9/18 sequence was provided, but was significant (P<.05) only for parity II. The number of pigs born increased with each ensuing parity. Pig weights at birth were not influenced by dietary protein sequence nor was the number or percentage weaned. Litter and pig weights and their gains during the lactation period did not differ by sow dietary treatment group. In totality the feeding of a 12/16% or 14/14% protein sequence resulted in similar reproductive performance, while the 9/18% regimen was somewhat less. The simplicity of providing the 14% diet throughout the entire reproductive cycle would seem warranted.

¹ Approved for publication as Journal Article 188–78 of The Ohio Agr. Res. and Devel. Center, Wooster.

² Appreciation is expressed to F. A. Vance, R. B. Gibbs, S. L. Stitzlein and O. J. Reed for their help in the collection of data and to Dr. J. Holman for the Statistical analysis.

³ Department of Animal Science, Ohio Agr. Res. and Devel. Center, Wooster.

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