Basic Horse biology - Ba sic Hor se biology H o r se s H o...

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

View Full Document Right Arrow Icon
10/12/13 Basic Horse biology animalscience2.ucdavis.edu/ans1/handouts/horses.html 1/3 Horses & Horse Biology A. Population/Census Information World Population Figures (United Nations Food and Agriculture Statistics - ( FAO ) World – 59 Million horses; 44 Million donkeys; 11 Million mules National Totals: Horses - China 7.6 million, USA 9.5 million, Mexico 6.3 million; Donkeys - China 7.9 million, Ethiopia 3.8 million, Mexico 3.2 million; Mules - China 3.7 million, Mexico 3.3 million, Brazil 1.3 million United States (Agriculture Statistics DataBase - USDA ) B. Basic Biology of Equus Caballus a) Puberty : 12 - 15 months; which varies with breed, nutritional status b) Seasonally polyestrus - If not impregnated, mares, generally, are more likely to have irregular cycles when compared with ewes or cows. Usually, mares enter an anestrus period during the winter months and stallion fertility can drop during this period as well (stallions will have lower seminal volume, lower number of sperm per ejaculate). Signs of estrus include allowing the stallion to sniff, nuzzle, bite on the neck, flank or perineal area; raised tail, hind legs apart and ‘winking’. Estrous Cycle - 21 to 23 day average Estrus Period - usually 5 to 7 days (longer in early spring) Ovulation - usually on days 3 through 5, 20% are multiple Gestation - 335 to 340 days, but varies with breed, age, sex c) Digestive Anatomy : Hind-gut fermenters, nonruminant herbivores. A large cecum and colon (between 30 to 70 liters) provides a site for microbial digestion of fibrous feeds. Passage rate is approximately 65-75 hours. Horses
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