A4. Feeding and Nutrition of Replacement Breeding Gilts

Question 1

Age and BW at the beginning and at the end of the rearing period

Answer 1

Age and BW;
From day 90 days until Insemination
First selection 90days (25-30kg)
Second selection 140d. ( 90kg)
Puberty (160d) - 100kg

Question 2

Factors influencing the onset of insemination

Answer 2

BCS; 3 ideal, out of 5 score

Back fat thickness /Rib fat
Optimal with backfat thickness of (16)-18-20mm.

Question 3

Feeding stratergies (depends on breeds, two main ones)

Answer 3

• Genetically lean maternal lines
  Fat inbuilding is delayed, (build muscles and not fat)
• Giltes with less lean potential
  Where muscle inbuilding finish earlier during growth

Question 4

Daily rations

Phase feding regime for high lean gilts (build muscle easy)

Answer 4

Phase 1. (60-100d) Ad libitum
Phase 2 (100-210d) 1,8-2.2 kg/day
Phase 3 (210-230) Ad libitum (flushing)
Phse 4 (230- 260) 1.8- 2.0 Kg/day

Question 5

Flushing

Answer 5

Phase 3 (210-230) Ad libitum (flushing)
2 weeks before ins. 125-140 kg)

14.2 MJ DE/kg. and 0.72% lysin)
o Increase number of ovulated eggs.
o Efficacy of insemination
o Dec embryo loss

Question 6

Protein content in feed

Answer 6

We express it in lysine, as it is the limiting aa
Requirement;
13 MJ DE
12- 8 (g) Lysine

Question 7

Energy contents of the feed

Answer 7

13- 14 MJ DE
12- 8 (g) Lysine 0.70-0.80%
0.46 threonine
Ca: P (0.90: 0.70) %