Effects of rapid temperature fluctuations prior to breeding on reproductive efficiency in replacement gilts

Johnson, Jay S; Martin, K.L.; Pohler, K. G.; Stewart, Kara R

doi:10.1016/j.jtherbio.2016.08.003

Cited by 15 publications

(15 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where Y = dependent variable of interest, µ = mean, R = recovery treatment, F = feeding treatment, K = replication, and e = error term. Temperature data were analyzed separately within the HS and recovery periods using repeated measures with an appropriate covariance structure and time (15-min intervals from 0 to 180 min) as the repeated effect as previously described (Johnson et al, 2016a(Johnson et al, , 2016bKpodo et al, 2020). Consumption attempt data were analyzed separately within the HS and recovery periods using repeated measures with an appropriate covariance structure and hour (1 to 3) as the repeated effect.…”

Section: Statisticsmentioning

confidence: 99%

“…Several recent studies have evaluated the effects of cooling methods on acute hyperthermia recovery in swine (Johnson et al, 2016a(Johnson et al, , 2016bSapkota et al, 2016;Kpodo et al, 2020). However, while some reports have determined that rapid cooling (e.g., return to thermoneutral environment and dousing with cold water) can be an effective method of quickly returning pigs to euthermia and preventing intestinal damage (Kpodo et al, 2020), others have shown that rapid cooling prevents the return of body temperature to euthermia, exacerbates intestinal damage, and increases the whole-body inflammatory response (Johnson et al, 2016a(Johnson et al, , 2016bSapkota et al, 2016). While reasons for these discrepancies are currently unknown, it may be due to study design differences and the effects of feed access (i.e., rapid cooling is only effective in studies where feed was withdrawn) as previously suggested (Kpodo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of feed removal on thermoregulation and intestinal morphology in pigs recovering from acute hyperthermia

Kpodo

Duttlinger

Maskal

et al. 2020

Journal of Animal Science

View full text Add to dashboard Cite

Feed consumption increases body temperature and may delay a return to euthermia and exacerbate intestinal injury following acute hyperthermia recovery in pigs. Therefore, the study objective was to evaluate the effects of feed removal on body temperature and intestinal morphology in pigs exposed to acute hyperthermia and then rapidly cooled. Twenty-four gilts (78.53 ± 5.46 kg) were exposed to thermoneutral (TN; n = 12 pigs; 21.21 ± 0.31 °C; 61.88 ± 6.93% RH) conditions for 6 h, or heat stress (HS; 38.51 ± 0.60 °C; 36.38 ± 3.40% RH) conditions for 3 h followed by a 3-h recovery period of rapid cooling (HSC;n = 12 pigs; TN conditions and cold water dousing). Within each recovery treatment, one-half of the pigs were provided feed ad libitum (AF; n = 6 pigs per recovery treatment) and one-half of the pigs were not provided feed (NF; n = 6 pigs per recovery treatment). Gastrointestinal (TGI), vaginal (TV), and skin (TSK) temperatures and respiration rate (RR) were recorded every 15 min. Pigs were video-recorded to assess feeding and drinking attempts. Immediately following the 6-h thermal stress period, pigs were euthanized, and intestinal samples were collected to assess morphology. During the HS period, Tv, TGI, TSK, and RR were increased (P < 0.01; 1.63, 2.05, 8.32 °C, and 88 breaths per min, respectively) in HSC vs. TN pigs, regardless of feeding treatment. Gastrointestinal temperature was greater (P = 0.03; 0.97 °C) in HSC + AF vs. HSC + NF pigs from 45 to 180 min of the recovery period. During the recovery period, feeding attempts were greater (P = 0.02; 195.38%) in AF vs. NF pigs. No drinking attempt differences were detected with any comparison (P > 0.05). A decrease (P < 0.01) in jejunum and ileum villus height (24.72% and 26.11%, respectively) and villus height-to-crypt depth ratio (24.03% and 25.29%, respectively) was observed in HSC vs. TN pigs, regardless of feeding treatment. Ileum goblet cells were reduced (P = 0.01; 37.87%) in HSC vs. TN pigs, regardless of feeding treatment. In summary, TGI decreased more rapidly following acute hyperthermia when the feed was removed, and this may have implications toward using feed removal as a strategy to promote acute hyperthermia recovery in pigs.

show abstract

Section: Statisticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of feed removal on thermoregulation and intestinal morphology in pigs recovering from acute hyperthermia

Kpodo

Duttlinger

Maskal

et al. 2020

Journal of Animal Science

View full text Add to dashboard Cite

show abstract

“…In cattle, less invasive studies have used automatic measurements of reticule-rumen boluses (Timsit et al, 2011;Liang et al, 2013), which give continuous rumen temperature measurements in real time (Lohölter et al, 2013;Lees et al, 2018). In pigs, gastrointestinal temperature can be measured using orally administered temperature sensors (or boluses, as commonly defined in similar sensors used in cattle studies) monitored with a wireless core body temperature data recorder (Johnson et al, 2016). Although the boluses allow measurement without disturbing the animal, they have short communication distances between the bolus and reader thus requiring manual data collection, the boluses are costly, and T B fluctuations may exist depending on the temperature of feed and water consumed (Lee et al, 2016b).…”

Section: Body Temperaturementioning

confidence: 99%

“…Alternatively, vaginal implantation of wireless sensors can accurately determine T B using a radio-telemetric system (Kyle et al, 1998;Johnson and Shade, 2017) or a temperature logger (Gebremedhin et al, 2008). Specifically, in pigs (Johnson et al, 2016), beef cattle (Burdick et al, 2012), and dairy cattle (Garner et al, 2016), vaginal temperature can be measured with a thermochron temperature recorder attached to a plastic device controlled internal drug releasing device. However, this is only effective in females.…”

Section: Body Temperaturementioning

confidence: 99%

Large-Scale Phenotyping of Livestock Welfare in Commercial Production Systems: A New Frontier in Animal Breeding

et al. 2020

View full text Add to dashboard Cite

Genomic breeding programs have been paramount in improving the rates of genetic progress of productive efficiency traits in livestock. Such improvement has been accompanied by the intensification of production systems, use of a wider range of precision technologies in routine management practices, and high-throughput phenotyping. Simultaneously, a greater public awareness of animal welfare has influenced livestock producers to place more emphasis on welfare relative to production traits. Therefore, management practices and breeding technologies in livestock have been developed in recent years to enhance animal welfare. In particular, genomic selection can be used to improve livestock social behavior, resilience to disease and other stress factors, and ease habituation to production system changes. The main requirements for including novel behavioral and welfare traits in genomic breeding schemes are: (1) to identify traits that represent the biological mechanisms of the industry breeding goals; (2) the availability of individual phenotypic records measured on a large number of animals (ideally with genomic information); (3) the derived traits are heritable, biologically meaningful, repeatable, and (ideally) not highly correlated with other traits already included in the selection indexes; and (4) genomic information is available for a large number of individuals (or genetically close individuals) with phenotypic records. In this review, we (1) describe a potential route for development of novel welfare indicator traits (using ideal phenotypes) for both genetic and genomic selection schemes; (2) summarize key indicator variables of livestock behavior and welfare, including a detailed assessment of thermal stress in livestock; (3) describe the primary statistical and bioinformatic methods available for large-scale data analyses of animal welfare; and (4) identify major advancements, challenges, and opportunities to generate high-throughput and large-scale datasets to enable genetic and genomic selection for improved welfare in livestock. A wide variety of novel welfare indicator traits can be derived from information captured by modern technology such as sensors, automatic feeding systems, milking robots, activity monitors, video cameras, and

show abstract

“…Many studies have attempted to characterize heat stress resistance in domestic animals, including pigs (Johnson et al 2016;Liu et al 2016), dairy (Kmiha et al 2017;Gantner et al 2017), and chickens (e.g., Chen et al 2017). Notably, genetic markers and functional genes have been identified, including heat shock protein (HSP) genes (e.g., Cedraz et al 2017), PtoEXPA12 (e.g., Zhang et al 2018), NAC domain-containing protein 19 (NAC019), and respiratory supercomplex factor 2 (RCF2) (Guan et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Whole-genome scanning for the heat-resistance-associated genes in the Droughtmaster breed (Bos taurus)

Jiang

Zhang

Yuan³

et al. 2019

3 Biotech

View full text Add to dashboard Cite

The Droughtmaster is a tropical breed of beef cattle developed in North Queensland that exhibits a combination of heat resistance and parasitic resistance from long-term artificial selection. Therefore, we used next-generation sequencing technology to screen the chromosomal regions and genes related to heat-resistance in cattle to provide data for improving cattle breeding. A total of 15,569,067 variants including 14,249,316 SNPs were obtained from two mixed pools by genome-wide resequencing. According to the results of the selective sweep analysis of the Droughtmaster pool compared to the nonheat resistant breeds pool, 81 candidate genes under selection in Droughtmaster were identified by combining Z HP and F ST analyses with a threshold standard of the top 1%, including SLC7A11, GYPC, and GYPC. In addition, 40 GO terms and 44 pathways were annotated from newly identified candidate genes. These signaling pathways were involved in environmental information processing, organismal systems, and metabolism. A majority of these genes have not been implicated in the previous studies of heat resistance. This study explored the genomic changes that result from long-term artificial selection, our findings help to explain the molecular mechanism of heat resistance in cattle.

show abstract

Effects of rapid temperature fluctuations prior to breeding on reproductive efficiency in replacement gilts

Cited by 15 publications

References 36 publications

Effects of feed removal on thermoregulation and intestinal morphology in pigs recovering from acute hyperthermia

Effects of feed removal on thermoregulation and intestinal morphology in pigs recovering from acute hyperthermia

Large-Scale Phenotyping of Livestock Welfare in Commercial Production Systems: A New Frontier in Animal Breeding

Whole-genome scanning for the heat-resistance-associated genes in the Droughtmaster breed (Bos taurus)

Contact Info

Product

Resources

About