Basic Pig Biology - Ba sic Pig Biology S w in e P ig B io...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
10/21/13 Basic Pig Biology animalscience2.ucdavis.edu/ans1/handouts/swine.html 1/3 Swine & Pig Biology A. Population/Census Information World Population Figures (United Nations Food and Agriculture Statistics - ( FAO ) World - 960 Million pigs United States (Agriculture Statistics DataBase - USDA ) US: 65 Million pigs; 57 million marketed; 8 million as breeding animals CA: 255,000 total pigs; 223,000 marketed; 32,000 for breeding B. Basic Biology of Sus Scrofa a) Puberty : 6 months in gilts (5 to 7 months and 150 to 250 lbs); 5-8 months in boars (between 175-250 lbs depending upon breed and season) b) Reproduction : Nonseasonally polyestrus - If not impregnated, sows will cycle in all seasons of the year, however, as the temperature climbs sows are less likely to express the visible signs of estrus (e.g., standing to be mounted, excitable and ‘nervous’ behavior); boars also decline in libido as summer temperatures climb Estrous Cycle - 21 day average (19-23) Estrus Period - lasts 60 hours in sows; 45 hrs in gilts Ovulation - 24-36 hours after onset of estrus; 15-20 eggs shed Gestation - 114 days (3 mo, 3 wks, 3 days); 8-10 pigs born/litter c) Digestive Anatomy : Simple stomached - nonruminants. The pig has a digestive system quite similar to that of humans. Because there is no rumen, the level of roughage in pig diets is low. Pigs also only chew food once (using a full complement of incisors and molars), with physical digestion occurring in the stomach (approximately 2 gallon capacity). Absorption of nutrients occurs in the small intestine. Typical diets include, principally corn and soybeans,
Image of page 1

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

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    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.

    Student Picture

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

  • Left Quote Icon

    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.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    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.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern