Lec 5 - Boar Structure Semen = Sperm + Accessory Fluids 4...

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Boar Structure Semen = Sperm + Accessory Fluids 4 fractions Pre-sperm 10-25 ml sperm-rich 30-60 ml (80-90% sperm) Post-sperm 70-130 ml gelatinous major at the end Goal 20 billion sperm per ejaculate range - 10-60 billion range - 100-300 ml time - 4-7 minutes Boar Management Purchase at least 45-60 days before use. 1. Isolate 2. Condition to your farm 3. Test-mate Transporting New Boars 1. Clean and disinfect the truck. 2. Provide suitable bedding and weather protection. 3. Separate boars from different pens. 4. Be careful - try to keep the boars calm. Isolation Isolate newly purchased boars for at least 30 days. 1. Isolation facility should be located several hundred feet from the rest of the herd. 2. Avoid unnecessary traffic. 3. Best to provide room for exercise. 4. If to be used in confinement, purchase boar and isolate in confinement. In Isolation 1. 2. Re-vaccinate for erysipelas and leptospirosis. 3. Do any recommended blood test. Test Mating Boar should be 7 1/2 - 8 months preferable after isolation. 1. Take a gilt in estrus. 2. Give the boar assistance. 3. Semen sample - optional sperm motility - 80-90% sperm number - 20 billion percent normal sperm --
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Boar Usage Services/week; not no. of sows Maximum No. of Services Maximum No. of Services Boar Age Daily Weekly Young (8 1/2-12 months) 1 5 Mature (> 12 months) 2 7 Table 4. Mating success for assisted 1 and unassisted boars Item Assisted Unassisted No. of boars 5 7 Boar age - 8.3 months No. of tests 20 28 Mating success % 95.0 2 57.1 3 Time to first mount (min) 0.9 1.8 Boar age - 9.2 months No. of tests 40 56 Mating success % 67.5 58.9 Time to first mount (min) 0.4 0.4 Boar age - 13.6 months No. of tests 16 24 Mating success % 75.0 75.0 Time to first mount (min) 0.3 0.5 1 Assistance was provided only during tests at 8.3 months of age 2 3 Significantly different (p<0.005) for assisted and unassisted boars Source: USDA Clay Center, NE Least Squares Means for Number of Services No. Services N TNB NBA FR, % 1 1024 8.25 7.41 81.6 2 9812 9.41 8.55 90.2
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> 3 15631 9.67 8.78 91.8 Table 2. Influence of number of matings per estrus on subsequent farrowing rate (140 boars @ 100 services = 14,000 services) No. of Matings No. Served Farrowing Rate 1 815 70.4 2 3927 86.1 3 7464 89.5 4+ 1762 89.6 Source: Clark et al, 1986 (Research Trial) Table 5. Comparison of serving sows by a single or two different boars in the same estrus Treatment No. Served No. Farrowed Farrowing Rate Total Born Born Alive Served by a single boar, multiple matings 307 249 81.1 11.06 10.04 Served by differnet boars in same estrus 708 670 94.6 11.37 10.65 Source: MLC summary of data from F.Hart, Homeleaze Farm, 1981 In Summer - Keep Boars Cool!
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This note was uploaded on 03/01/2012 for the course ANSC 443 taught by Professor Staff during the Fall '08 term at Purdue.

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Lec 5 - Boar Structure Semen = Sperm + Accessory Fluids 4...

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