Nathan Winkelman, DVM, president and co-owner of Swine Services Unlimited, Inc. (SSUI), is the 2019 recipient of the Allen D. Leman Science in Practice Award, which is presented at the annual Allen D. Leman Swine Conference in Saint Paul, MN. Dr. Winkelman caught the science bug early in his career and, thankfully, never found a cure for his orientation toward discovery.Continue reading “Dr. Nathan Winkelman to receive the Science in Practice award”
In this article written for the National Hog Farmer, PhD candidate April Estrada describes the high diversity of Streptococcus suis (S.suis) isolates.Continue reading “Distribution of pathogenic Streptococcus suis in the US”
This report is the February edition of the Swine Disease Eradication Center (SDEC) research update. Not sure what the SDEC is? Check out this quick read about our research group collaborating with industry partners to solve problems faced by the swine industry.
Dr. Vilalta collaborated with Minnesota-based producers, the Veterinary Diagnostic Laboratory and the MycoLab to investigate processing fluids as a sample type for the detection of Mycoplasma hyopneumoniae.Continue reading “Evaluation of the feasibility of Mycoplasma hyopneumoniae detection in processing fluids”
A glitch in WordPress prevented this post from being released on Friday, so we are sharing it with you this morning. Sorry for the inconvenience, we are working with the platform to fix the issue.
This is our Friday rubric: every week a new Science Page from the Bob Morrison’s Swine Health Monitoring Project. The previous editions of the science page are available on our website.
This week, we are sharing a report by Drs. Patterson and Foxcroft about gilt management. Previously, we shared the recording of her presentation during the 2018 Leman conference. Below is an update on her work at the University of Alberta.
- Successful replacement gilt management starts at birth
- A low individual birth weight and a “Low litter birth weight sow phenotype” are key factors determining the efficiency of replacement gilt production
- Good gilt selection and pre-breeding programs remove early culling for reproductive problems as a factor in sow life time productivity
Gilt are the foundation of good production (Tubbs, 2015) and drive farm success (Ketchem and Rix, 2015).Low individual gilt birth weights have
been linked to increased preͲweaning mortality (Magnabosco et al., 2015), poor growth until finishing, compromised ovarian and uterine development (Deligeorgis et al., 1985), fewer pigs produced over three parities and earlier removal from the herd (Magnabosco et al. 2016). At sow level, a low litter “birth weight phenotype“(BWP) carries all the same risks as a low individual birth weight, but as a “litter” trait. As part of a National Pork Board-funded project to investigate links between litter BWP and sow lifetime productivity (SLP) conducted in collaboration with Holden Farms Inc., litter BWP was determined over at least two successive parities.
Multiplication sows (n = 651) were then classified as having either a low (L, < 1.18 kg, n=63), lowͲmedium (LM,> or = 1.16 to < or = 1.36 kg, n=281), medium-high (MH, > 1.36 and < or =1.6 kg, n=254) or high (H, > 1.6 kg, n=53) average litter BWP. Low BWP sows produced progeny with limited survivability after birth, poor retention during gilt development, and overall had a lower efficiency of replacement gilt production. Although BWP had a significant effect on weight and growth rate at the time of Pre-Selection (170 days), when puberty stimulation commenced at around 182 days of age, BWP did not affect the days to recorded first estrus.
Therefore, the growth performance of even the lighter gilts born did not delay the onset of pubertal estrus. Furthermore, for those low birth
weight pigs that survived and were selected as replacements on the basis of a recorded pubertal estrus event, a low BWP did not affect total pigs
born over four parities, or longevity in the sow herd. In contrast, gilts born in litters with a high BWP had lower retention rates in the sow herd.
Take home messages
Low birth weights affect the efficiency of replacement gilt production because these gilts either die, or are voluntarily non-selected because of relatively poor growth performance: However, if they survive, they have an equal chance of being bred and have better performance in the breeding herd that had high birth weight gilts.
Irrespective of gilt origin, earlier maturing gilts that have a recorded standing heat (HNS) within 30 days of starting boar exposure are the premium “Select” gilt population. They are inseminated earlier, have fewer non-productive days (NPD), are culled less due to reproductive problems, have higher farrowing rates, have more pigs born alive and are culled later (see Patterson and Foxcroft, 2019).
To be reliable and cost-effective, the stimulation program must involve daily direct contact between the gilts and high libido boars: This maximizes the “boar effect” and drives the efficiency in the gilt development unit (GDU). Adequate resources need to be allocated to the GDU (staffing, facilities, focus and time) and daily records of GDU performance should drive key management decisions (e.g. PG600 intervention). Only breeding-eligible gilts with a recorded HNS should be delivered to the sow farm or moved to the pre-breeding area. Breeding gilts at 2nd or 3rd estrus, at a target body weight of 135-150 kg, and after utilizing at least a 14-day pre-breeding “acclimation period” during which gilts are essentially on full feed, are the next crucial steps in optimizing SLP.
Take home message
Individual recording of gilt performance in the GDU is as critical as, and has longer-lasting consequences than, individual recording of breeding sow performance after weaning.
References are available on the original document.
We launched a new series on the blog last year. Once a month, we are sharing with you a presentation given at the Allen D. Leman swine conference, on topics that the swine group found interesting, innovative or that lead to great discussions.
We can find all of the presentations selected from last year’s conference on the blog here.
Our sixth presentation is by Dr. Matheus Costa, our newest colleague in the swine group, about his work on colitis and antimicrobial resistance when he was working at the University of Saskatchewan.Continue reading “Best of Leman 2018 series #6: M. Costa – Guts and bugs: understanding colitis to fight AMR”