Abstract
Twenty-four Saanen goats (fifteen multiparous and nine primiparous) during their lactation period were used, from the kidding until the 200th day of lactation; and were distributed in a completely randomized design and in a factorial arrangement (3 diets x 2 parity orders). The diets were composed of either soybean meal (SBM), soybean meal plus inactive dry yeast (SMDY) or inactive dry yeast (DY) used as the protein source. The analyses of milk yield, body weight and dry matter intake (DMI) were made through the Bayesian methodology. For construct the lactation curves were used the Wood’s nonlinear model. The inclusion of inactive dry yeast in the diets reduced the rate of yield increase until the lactation peak for primiparous goats, but for multiparous goats the reverse was noted. The SMDY diet reduced the rate of yield decline after peak for primiparous goats, whereas for multiparous goats the inclusion of inactive dry yeast in the diet increased the decline of the rate of yield during this period. It was observed that inactive dry yeast can be used to replace soybean meal in diets used for multiparous Saanen goats.
Highlights
The control of lactating is a determining factor for the success of goat milk production systems
The soybean meal plus inactive dry yeast (SMDY) diet reduced the rate of yield decline after peak for primiparous goats, whereas for multiparous goats the inclusion of inactive dry yeast in the diet increased the decline of the rate of yield during this period
There was a reduction in the dry matter intake for the primiparous goats receiving the diets with partial replacement of the soybean meal for the inactive dry yeast until the 51st lactation day with 1.13 kg day-1 being the smallest intake
Summary
The control of lactating is a determining factor for the success of goat milk production systems. Through the knowledge about the lactation curve helps to plan the nutrition management, in order to maximize the milk yield and quality. It estimates the lactation persistency, the time of the peak yield, the duration of the peak and the highest production, all of which are tools used by breeders to select their animals. There are different models for the study of lactation curves. The Wood’s model has been adopted in the majority of lactation curve studies because it allows for the estimation of basic curve features, such as the highest milk production, the time to reach this level of production and its persistency, using only three parameters (WOOD, 1967)
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
