Effects of Sow Gut Modifying Feed Additives on Reproductive Characteristics and Progeny Growth Performance
Abstract
Providing wholesome pork products to consumers involves raising healthy pigs to grow well and be feed efficient from birth to market. Raising these pigs starts with ensuring the sow is healthy and provided good nutrition in gestation and lactation. Therefore, this dissertation primarily focuses on research of gut modifying feed additives fed to sows in gestation and lactation (and to their progeny in Chapter 3) to enhance reproductive performance and litter growth to weaning (and in the nursery). In Chapter 2, a total of 606 sows and their progeny were used to determine if feeding gestating and lactating sows a proprietary strain of Pichia guilliermondi as a whole-cell inactivated yeast product (WCY; CitriStim, ADM Animal Nutrition, Quincy, IL) improves sow and litter performance in a commercial production system. Sows were fed a control (CON) diet or control diet fortified with 0.15% of the WCY from d 35 of gestation through lactation. Sows supplemented with WCY in gestation and lactation had a greater number of total born piglets by 0.45 pigs (P < 0.04), piglets born alive (P < 0.04), heavier born alive litter weights (P < 0.001), and greater post cross-foster litter size (P < 0.001) compared to CON fed sows. Litter size at weaning was increased by 0.54 pigs when sows were fed WCY compared to CON (P< 0.001). However, litter weaning weights and 21-day adjusted litter weaning weights were similar (P > 0.158) with the 21-day adjusted litter weaning weights being numerically greater for the WCY sows. The average piglet weaning weights from CON fed sows were heavier by 0.35 kg compared to WCY (P < 0.001). This increase in body weight of piglets from CON fed sows is partially explained by their 0.93 days longer lactation (P < 0.001) and may also be due to the smaller litter size nursed throughout lactation. The percent of litters treated for scours decreased from 38.3% to 14.2% when sows were fed WCY (P < 0.001). The distribution of birth and weaning weights was not different (P > 0.2461) between treatments.Chapter 3 encompasses a sow experiment where progeny were followed onto the nursery for a 28-d study. Forty-seven sows and their progeny were used to determine if feeding gestating and lactating sows a Bacillus licheniformis direct-fed microbial (DFM), an organic acid blend of medium and short-chain fatty acids (OA), or in combination improves sow lactation feed and water intake, litter growth, and subsequent reproductive performance. At weaning, offspring were fed a positive control diet (PC), negative control diet (NC), or a diet representative of their dam’s treatment to determine if there is an additive benefit to also feeding DFM and/or OA to nursery pigs in addition to their dams. On approximately d 80 of gestation, sows were fed one of four diets in a 2 ´ 2 factorial design: 1) gestation control (CON), 2) CON with DFM (1.6x109 CFU/kg of complete feed), 3) CON with 0.4% OA, 4) CON with both DFM and OA. Dietary treatments were also fed throughout lactation.
Degree
Ph.D.
Advisors
Richert, Purdue University.
Subject Area
Nutrition|Energy|Animal sciences|Medical imaging|Pharmaceutical sciences
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