Comprehensive Swine Industry and Breeds Study Guide
Identification and Characteristics of Swine Breeds
Permanent Orientation and Use Case: When pigs are described as "permanently oriented," it typically indicates they are destined for the food chain. Consequently, breeds in this category place a significant emphasis on growth and carcass traits.
Distinguishing Visual Characteristics: * Color: Breed identification is heavily reliant on the color of the animal. * Ear Characteristics: Ears are categorized as either erect (pointing up) or floppy/down (pointing down).
Industry Composition: While specific breeds exist, the majority of pigs in the United States are "strains of breeds," specifically terminal crossbreds, particularly within modern hog facilities.
Popularity and Registration Data: * Statistics regarding popularity are based on registered numbers rather than total swine population. Most pigs are crossbreds. * The Berkshire Breed: One of the oldest breeds and foundational to the US swine industry for the last years. They were exceptionally popular in the and . * Registration Reporting Shift (2020): In , the Berkshire breed changed their reporting method from the number of litters to the number of head. This caused a dramatic statistical jump in their numbers. For context, an average litter contains or more pigs, so reporting by individuals rather than litters exaggerates the count.
Detailed Breed Descriptions: * Yorkshire: The most popular breed of pig. They are white with erect (up) ears. This is a critical identifying fact. * Duroc: A red hog, ranging from light mahogany to very dark red. They are known for being hardy and popular. * Hampshire: A black and white hog characterized by a white "belt" across the shoulders. They are popular as terminal sires. * Landrace: A white maternal breed with floppy ears. Their ears are notably floppy to the point of being parallel with the bridge of their nose. * Chester White: A white breed with down ears. They differ from the Landrace in ear structure; the Chester White's ears come out slightly at the base of the skull before flopping down. * Poland China: A black breed with white on the feet and snout (similar in color to the Berkshire) featuring down ears. They are a big-framed, large-boned, and fast-growing breed. * Spotted: As the name implies, a spotted breed. Some call them "spotted Poland China," but they are a distinct, separate breed known for hardiness and feed efficiency.
Classification of Breeds: Sire vs. Maternal
Sire Breeds (Terminal Oriented): * Primary Emphasis: Meat production, muscle (an indicator of meat), growth rate, and carcass traits. * General Rule: These are usually the darker-colored breeds. * Duroc Details: Developed in the Eastern US and Corn Belt. Highly durable and hardy. They have a specific "marbling niche," meaning they produce high levels of intramuscular fat, which adds flavor, juiciness, and tenderness to the meat. * Berkshire Details: Known for a "quality and flavor niche," specifically regarding meat , water-holding capacity, and the quality of lean muscle. They were the first to implement branded meat products, similar to the "Certified Angus Beef" model, under the name "Certified Berkshire Gold." * Hampshire Details: Common in the US and Europe (e.g., Scotland). Historically criticized for their massive size, they remain a heavy-muscled, fast-growing, carcass-driven breed. The white belt is often called "The mark of a meat hog." * Spotted Details: Known for being hardy, fast-growing, and efficient at converting feed into gain at the trough. * Poland China Details: Shares genetic origins with the Berkshire and Hampshire. Noted for being big-framed and stout in structure.
Maternal Breeds: * Primary Emphasis: Conception rate, litter size (prolificacy), milk production (impacting piglet size), and mothering ability. * General Rule: These are usually the white-colored breeds. * Yorkshire Details: The most numerous breed in the US and Canada. Historically called "The Mother Breed." Today, their slogan is "The Mother Breed and a whole lot more," reflecting their dual-purpose ability to also provide good growth and carcass traits. They have the most extensive genetic database and highly developed Expected Progeny Differences (EPDs). * Landrace Details: Favored for farrowing and raising very large litters. * Chester White Details: Developed in Chester County, Pennsylvania. Valued for high milk production, large litters, and longevity in the production herd.
Swine Industry Terminology and Biology
Terminology: * Gilt: A young female pig. * Sow: A mature female pig. * Boar: An intact male pig. * Barrow: A castrated male pig. * Farrow (Farrowing): The technical term for the process of giving birth in swine. * Piglet: General term for young pigs. * Pig vs. Hog: Often used interchangeably, though "pig" may refer to a younger "feeder pig" ( to pounds), while "hog" often refers to a "market hog" at its endpoint weight.
Reproductive Lifecycle: * Goal: Gilt's first litter at approximately year of age. * Breeding Age: Gilts should be bred at approximately months of age. * Gestation Length: days, commonly remembered by the " months, weeks, days" rule.
Castration Rationale: * Growth and Fat: Castration changes the growth curve and how the animal puts on fat. * Behavior: Results in a calmer disposition. * Meat Quality (Boar Taint): Intact males produce meat with a distinct, unpleasant flavor profile known as "boar taint," caused by testosterone. For food purposes, males are castrated to ensure meat quality.
Prolificacy and Weaning: * The US average as of February is pigs per litter. * A single sow can produce upwards of offspring per year, assuming to litters per calendar year. * Standard Weaning: Occurs between and weeks of age. * Segregated Early Weaning (SEW): Occurs at to days of age. * Advantage: The sow stops lactating sooner, reducing metabolic demand and allowing her to return to production/re-breeding faster. * Disadvantage: Increased stress on piglets, requiring specialized management to prevent high mortality or morbidity (sickness).
Market Weights: Modern market hogs are harvested at to pounds. Historically, the max weight was often capped at pounds, and averages were closer to pounds.
STAGES: Acronym for the "Swine Testing and Genetic Evaluation System," which processes genetic data and calculates EPDs for the industry.
Production Segments and Facility Management
Industry Segments: * Farrow-to-Wean: Focuses on birth through weaning. * Finishing/Grow out: Taking weaned pigs to market weight. * Farrow-to-Finish: Involves every step of the production cycle. Advantages include fewer transfer steps, better biosecurity, and total control over genetics and growth. * Purebred/Seedstock: Producing elite genetics for next-generation replacements (gilts and boars).
Facilities and Waste Management: * Lagoons: Ponds used to store and treat manure/waste under purification management. The resulting product is often applied to fields as natural fertilizer (a multibillion-dollar industry). * Methane Digesters: Technology that captures energy from waste to create power.
Breeding Management: * Artificial Insemination (AI): Extremely common in the swine industry. * Hand Mating: Bringing a boar to a sow rather than letting them run together. * Heat Detection: Signs include a swollen vulva and "standing heat." In standing heat, if pressure is applied to a sow's back, she will "lock up" and stand still.
Farrowing Management: * Farrowing Crates: Specifically designed to protect piglets from being crushed or stepped on by the sow (who weighs pounds). * Slotted Floors: Used for sanitation; it allows urine and feces to fall through, making the environment easier to spray out and disinfect. * Heat Lamps: Used to draw piglets away from the sow to a warm area, reducing the risk of accidental crushing.
Nursery/Starter Facility: * Temperature is kept warm ( to ). * Space allocation is critical: enough room to move and grow, but not so much that it encourages excessive fighting to establish a "pecking order."
Grow Out Facility: * Pigs reach finished weight in about months. * All-in, All-out System: Pigs enter and exit the facility together as a uniform group to manage health and environmental consistency.
Technical Advancements: * Watering Systems: Pigs use nipple systems rather than troughs. New designs with small troughs underneath the nipple have been shown to reduce water wastage by up to .
Meat Quality and Nutrition
Meat Quality Concerns: The industry avoids "PSE" meat, which stands for Pale, Soft, and Exudative. This tissue does not hold water well and is often dry when cooked.
Nutrition: * Feed is the primary cost of production. * Pigs require highly dynamic diets, often changing through to different rations in a single month as they grow. * The First Limiting Amino Acid: Lysine () is the most critical/limiting amino acid in swine diets.
Questions & Discussion
Q: What characteristics are common for sire breeds? * A: Muscling, growth rate, carcass characteristics, and dark-colored coats. (All of the above).
Q: Which of the following is characterized as a sire breed? (Choices: Hampshire, Landrace, Yorkshire, Chester White). * A: Hampshire.
Q: Which is considered a maternal breed? (Choices: Hampshire, Duroc, Landrace, Poland China). * A: Landrace.
Q: What are important production traits in the gestation/farrowing portion of an operation? * A: Number born alive, conception rate, and number of weaned pigs. (All of the above).
Q: What is the first limiting amino acid in most swine diets? * A: Lysine.