Mauro Venturini, Joao de Agostini Losano, Daniella Heredia, Maria Camila López Duarte, Jose Infante, Federico Podversich, Maura McGraw, Muhammad Sohail Siddique, Jillian Guertin, Brette Poliakiwski, Damon J Smith, Ky Pohler, Nicolas DiLorenzo, Bradford W Daigneault, Angela Gonella Diaza
{"title":"年龄布兰科公牛的剩余采食量及繁殖相关参数。","authors":"Mauro Venturini, Joao de Agostini Losano, Daniella Heredia, Maria Camila López Duarte, Jose Infante, Federico Podversich, Maura McGraw, Muhammad Sohail Siddique, Jillian Guertin, Brette Poliakiwski, Damon J Smith, Ky Pohler, Nicolas DiLorenzo, Bradford W Daigneault, Angela Gonella Diaza","doi":"10.1093/jas/skaf055","DOIUrl":null,"url":null,"abstract":"<p><p>Residual feed intake (RFI) is a widely employed metric to estimate feed efficiency, which compares actual feed intake to expected feed intake. Enhancing feed efficiency while maintaining reproductive performance is critical to maximizing the profitability of beef production systems. Published data exhibit conflicting results concerning the impact of RFI on reproductive parameters. Our objective was to evaluate the relationship between RFI and reproductive parameters in young Brangus bulls. Sixty bulls were randomly selected at the beginning of a 56-day feed efficiency test. At the start, scrotal circumference (SC) was measured, blood samples were taken for testosterone concentration analysis, and semen samples were collected by electroejaculation. Fresh semen was visually evaluated for motility, morphology, and plasma membrane integrity. Sperm kinematics and concentration were objectively determined via computer-assisted sperm analysis (CASA-IVOS II System). At the end of the test, bulls were classified as feed efficient (low RFI: LRFI) or feed inefficient (high RFI: HRFI) and grouped based on RFI divergence. Two models were constructed to analyze data: one using all bulls (Halves, n = 58) and one using the 25% extremes of the population (Tails, n = 30). Data were compared using a Completely Randomized Design (CRD). Using the halves model, only major defects (P < 0.04) and total defects (P = 0.014) were significantly affected by RFI group, with LRFI bulls showing a lower proportion of abnormal sperm cells. In the tails model, only SC (P = 0.01) was significantly affected by RFI, with LRFI bulls having a larger SC compared to HRFI bulls. The RFI group did not affect CASA-derived traits in either model. In conclusion, most fertility-related measurements were not affected by RFI status in young Brangus bulls. These results suggest that selection for feed efficiency in young bulls can be achieved without negatively impacting seminal characteristics associated with fertility.</p>","PeriodicalId":14895,"journal":{"name":"Journal of animal science","volume":" ","pages":""},"PeriodicalIF":2.7000,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Residual Feed Intake and Reproductive-related Parameters in Yearling Brangus Bulls.\",\"authors\":\"Mauro Venturini, Joao de Agostini Losano, Daniella Heredia, Maria Camila López Duarte, Jose Infante, Federico Podversich, Maura McGraw, Muhammad Sohail Siddique, Jillian Guertin, Brette Poliakiwski, Damon J Smith, Ky Pohler, Nicolas DiLorenzo, Bradford W Daigneault, Angela Gonella Diaza\",\"doi\":\"10.1093/jas/skaf055\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p><p>Residual feed intake (RFI) is a widely employed metric to estimate feed efficiency, which compares actual feed intake to expected feed intake. Enhancing feed efficiency while maintaining reproductive performance is critical to maximizing the profitability of beef production systems. Published data exhibit conflicting results concerning the impact of RFI on reproductive parameters. Our objective was to evaluate the relationship between RFI and reproductive parameters in young Brangus bulls. Sixty bulls were randomly selected at the beginning of a 56-day feed efficiency test. At the start, scrotal circumference (SC) was measured, blood samples were taken for testosterone concentration analysis, and semen samples were collected by electroejaculation. Fresh semen was visually evaluated for motility, morphology, and plasma membrane integrity. Sperm kinematics and concentration were objectively determined via computer-assisted sperm analysis (CASA-IVOS II System). At the end of the test, bulls were classified as feed efficient (low RFI: LRFI) or feed inefficient (high RFI: HRFI) and grouped based on RFI divergence. Two models were constructed to analyze data: one using all bulls (Halves, n = 58) and one using the 25% extremes of the population (Tails, n = 30). Data were compared using a Completely Randomized Design (CRD). Using the halves model, only major defects (P < 0.04) and total defects (P = 0.014) were significantly affected by RFI group, with LRFI bulls showing a lower proportion of abnormal sperm cells. In the tails model, only SC (P = 0.01) was significantly affected by RFI, with LRFI bulls having a larger SC compared to HRFI bulls. The RFI group did not affect CASA-derived traits in either model. In conclusion, most fertility-related measurements were not affected by RFI status in young Brangus bulls. These results suggest that selection for feed efficiency in young bulls can be achieved without negatively impacting seminal characteristics associated with fertility.</p>\",\"PeriodicalId\":14895,\"journal\":{\"name\":\"Journal of animal science\",\"volume\":\" \",\"pages\":\"\"},\"PeriodicalIF\":2.7000,\"publicationDate\":\"2025-02-24\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of animal science\",\"FirstCategoryId\":\"97\",\"ListUrlMain\":\"https://doi.org/10.1093/jas/skaf055\",\"RegionNum\":2,\"RegionCategory\":\"农林科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"AGRICULTURE, DAIRY & ANIMAL SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of animal science","FirstCategoryId":"97","ListUrlMain":"https://doi.org/10.1093/jas/skaf055","RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURE, DAIRY & ANIMAL SCIENCE","Score":null,"Total":0}
Residual Feed Intake and Reproductive-related Parameters in Yearling Brangus Bulls.
Residual feed intake (RFI) is a widely employed metric to estimate feed efficiency, which compares actual feed intake to expected feed intake. Enhancing feed efficiency while maintaining reproductive performance is critical to maximizing the profitability of beef production systems. Published data exhibit conflicting results concerning the impact of RFI on reproductive parameters. Our objective was to evaluate the relationship between RFI and reproductive parameters in young Brangus bulls. Sixty bulls were randomly selected at the beginning of a 56-day feed efficiency test. At the start, scrotal circumference (SC) was measured, blood samples were taken for testosterone concentration analysis, and semen samples were collected by electroejaculation. Fresh semen was visually evaluated for motility, morphology, and plasma membrane integrity. Sperm kinematics and concentration were objectively determined via computer-assisted sperm analysis (CASA-IVOS II System). At the end of the test, bulls were classified as feed efficient (low RFI: LRFI) or feed inefficient (high RFI: HRFI) and grouped based on RFI divergence. Two models were constructed to analyze data: one using all bulls (Halves, n = 58) and one using the 25% extremes of the population (Tails, n = 30). Data were compared using a Completely Randomized Design (CRD). Using the halves model, only major defects (P < 0.04) and total defects (P = 0.014) were significantly affected by RFI group, with LRFI bulls showing a lower proportion of abnormal sperm cells. In the tails model, only SC (P = 0.01) was significantly affected by RFI, with LRFI bulls having a larger SC compared to HRFI bulls. The RFI group did not affect CASA-derived traits in either model. In conclusion, most fertility-related measurements were not affected by RFI status in young Brangus bulls. These results suggest that selection for feed efficiency in young bulls can be achieved without negatively impacting seminal characteristics associated with fertility.
期刊介绍：
The Journal of Animal Science (JAS) is the premier journal for animal science and serves as the leading source of new knowledge and perspective in this area. JAS publishes more than 500 fully reviewed research articles, invited reviews, technical notes, and letters to the editor each year.
Articles published in JAS encompass a broad range of research topics in animal production and fundamental aspects of genetics, nutrition, physiology, and preparation and utilization of animal products. Articles typically report research with beef cattle, companion animals, goats, horses, pigs, and sheep; however, studies involving other farm animals, aquatic and wildlife species, and laboratory animal species that address fundamental questions related to livestock and companion animal biology will be considered for publication.
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