Lactation curves and economic results of Saanen goats fed increasing dietary energy levels obtained by the addition of calcium salts of fatty acids

Revista Brasileira de Zootecnia

Rodrigo De Souza¹  Claudete Regina Alcalde¹  Carlos Antonio Lopes De Oliveira¹  Bruna Susan De Labio Molina¹  Francisco De Assis Fonseca De Macedo¹  Ludmila Couto Gomes¹  Bruna Hygino¹  Ana Paula Silva Possamai¹ 

[1] ,Universidade Estadual de Maringá Departamento de Zootecnia Maringá PR ,Brasil

关键词: calcium soap;    dry matter intake;    energy intake;    lactation persistence;    Lactoplus®;    peak lactation;   

DOI  :  10.1590/S1516-35982014000200004

来源: SciELO

【 摘 要 】

The objective of this study was to evaluate the use of calcium salts of fatty acids (CSFA) to increase the dietary energy levels for Saanen goats and their effects on the lactation curve, dry matter intake, body weight, and economic results of the goats. Twenty multiparous goats, weighing an average of 63.5±10.3 kg, were randomly assigned to one of four treatment groups, each receiving one of the following dietary energy levels: a control diet consisting of 2.6 Mcal of metabolizable energy per kg of dry matter (Mcal ME/kg DM) or a test diet supplemented with CSFA (Lactoplus®) to obtain 2.7, 2.8, or 2.9 Mcal ME/kg DM. Goats were housed in individual stalls and were fed and milked twice daily. The animals were evaluated until 180 days in milk by measuring dry matter intake and milk yield. These measurements were used to calculate feed efficiencies and the cost-benefit ratio of diet and lactation curves using Wood's nonlinear model. Increasing dietary energy levels showed no effect on body weight. Supplementation with CSFA did not limit dry matter intake; however, it changed the shape of the lactation curve by promoting a late peak lactation with a longer duration. Milk yields at 180 days in milk had a quadratic increase with a maximum energy level at 2.85 Mcal ME/kg DM. Increasing the dietary energy level for Saanen goats using CSFA changes their lactation curves, with the best milk production achieved with a 2.85 Mcal ME/kg DM diet; however, the greatest economic results were obtained with a 2.7 Mcal ME/kg DM diet.

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