{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lec 14

Lec 14 - Modeling Lactation Energy and Lysine Requirements...

This preview shows pages 1–3. Sign up to view the full content.

Modeling Lactation Energy and Lysine Requirements Brian Richert and Allan Schinckel Energy Requirements Maintenance 80% of energy required for maintenance 15% for maternal wt. gain (lean and fat) 5% for products of conception Target weight gains (not including uterine and conceptus) Parity Gain, kg 1 30 2 25 3 25 4 20 5 15 6 10 Energy required Maintenance Kcal/day = 106 kcal/kg wt .75 ~ 106 Kcal x ((wt, kg x .2) + 13) i.e., 150 kg sow 13 + 0.2(150) = 13 + 30 = 43 43 x 106 = 4.56 Mcal ME/day Conceptus 0.2 Mcal ME/day Maternal gain Parity 1 target 30 kg 4.8 Mcal ME/kg gain 4.8 x 30 = 144 Mcal ME 114 days of gestation 144/114 = 1.26 Mcal ME/day Total 4.56 + 0.2 + 1.26 = 6.02 Mcal ME If diet contains 3.0 Mcal ME/kg, then 6.02/3 = 2.01 kg/day Note: Critical temp 18°C Warm floor 60 g more feed per day per 1°C drop effective in temperature Gain Natural wt gain is assumed to be 75% lean, 25% fat Target 30 kg gain Products of Conception 20 kg gain Maternal gain of 30 kg plus 20 kg of products of conception contain about 60% lean equivalent kg lean = 50 x 0.6 = 30 kg lean This lean contains 22% protein

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
.30 x 0.22 = 6.6 kg protein over 114 days of gestation, protein gain is 58 g/day Lysine Requirement 58 g protein contains 6.8% lysine Lysine required: 58 x 0.64 = 4 g lys/d Used with 50% efficiency, therefore supply 8 g/day Maintenance lysine requirement 50 mg/kg metabolic wt = 50 mg/(kg liveweight) .75 150 kg liveweight = 2.14 grams/day Total daily requirement 10.14 g lysine/day Amount of lysine fed affects weight gain and composition of gain
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern