The effect of age, interval collection and season on selected semen parameters and prediction of AI boars productivity

Knecht, Damian; Jankowska-Mąkosa, Anna; Duziński, Kamil

doi:10.1016/j.livsci.2017.04.013

Cited by 21 publications

(27 citation statements)

References 33 publications

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“…Em relação a concentração espermática, os resultados deste estudo foram semelhantes aos apresentados na literatura, os quais demonstram uma redução no número de espermatozoides por ejaculados em animais com frequência de coletas de sete vezes na semana e, consequentemente com menor produção de doses inseminantes (DIs) [10]. Esta redução pode ser decorrente da alta exigência ao organismo, afetando a espermatogênese, não suprindo a demanda necessária de células espermáticas em um curto período de tempo [11]. Outros autores comentam com base em trabalho semelhante executado, que essa redução pode ser fisiológica, ou seja, observada quando o manejo reprodutivo de coletas é realizado de forma consecutiva e visando a maximização da produção de DIs [12].…”

Section: Discussionunclassified

“…O índice de reposição em uma Central de Produção de Sêmen (CPS) supera a faixa dos 80% do plantel, tendo como principal objetivo a constante atualização genética [13]. A permanência curta nas CPS faz com que as empresas exijam ao máximo a capacidade reprodutiva dos cachaços, ou seja, buscam a precocidade na atividade reprodutiva dos machos e a redução dos intervalos entre as coletas de sêmen [11].…”

Section: Introductionunclassified

“…Por outro lado, um ejaculado de qualidade é influenciado por diversos fatores extrínsecos e intrínsecos, onde a frequência de coletas pode refletir diretamente na espermatogênese [11]. Nesse sentido, as informações relacionadas a frequência de coletas de sêmen em machos no início da vida reprodutiva, bem como a possibilidade de reduzir o intervalo entre coletas são incipientes e pouco conclusivas.…”

Section: Introductionunclassified

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Intervals of Semen Collection from Boars during Early Reproductive Life: Evaluation of Seminal Fluid Parameters

Dornelles

Rossi

Schlösser

et al. 2019

Acta Scientiae. Vet.

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Intervalos de coletas de sêmen em reprodutores suínos no início da vida reprodutiva: avaliação dos parâmetros seminaisABSTRACT Background: In swine production, good reproduction rates can be achieved through genetic selection and reproductive biotechnologies. One of these biotechnologies is artificial insemination, which contributes to disseminate genes and optimize breeding boars, thus improving the quality of insemination doses. This study focused on evaluating the intervals between semen collection from boars at the beginning of their reproductive maturity vis-à-vis the viability of insemination doses. Materials, Methods & Results:Twenty 9-month-old boars of the genetic lineage AGPIC 337 (Agroceres PIC) were used in this study. The experimental design used here was completely randomized, and the randomly selected males were divided into four treatment groups, which were named according to the interval between semen sample collections: T1: 2 days; T2: 3 days; T3: 4 days and T4: 7 days. Each treatment comprised 5 animals, and at the end of the 90 days of this study, a total of 150 ejaculates were obtained in T1, 110 in T2, 90 in T3 and 60 in T4. The values of total motility, volume and sperm concentration of the ejaculates were evaluated, as was oxidative stress by means of thiobarbituric acid reactive substances (TBARS), the latter after 0, 72, 120 and 168 h of the study. Membrane integrity was evaluated at 0, 72, 120 and 168 h using the eosin-nigrosin staining procedure. Sperm heat resistance was tested after 120 h, and sperm morphology after 72, 120 and 168 h. Sperm concentrations differed, with T3 showing 27.04% and 29.65% higher concentrations (P < 0.05) than groups T2 and T1, respectively. Total motility in group T4 was 0.56%, 1.98% and 3.28% higher (P < 0.05) than in T3, T2 and T1, respectively, indicating that the 7-day interval produced the best result. The heat resistance test showed the expected results, i.e., T2 and T4 did not differ in terms of total motility, but that of T4 was 4.96% higher (P < 0.05) than T3 and 7.71% higher than T1. As for plasma membrane integrity, T4 had 6.45%, 8.09% and 12.72% more cells with intact membranes (P < 0.05) than T3, T2 and T1, respectively. With regard to TBARS, group T1 showed higher concentrations (P < 0.05) than T2 (6.18%), T3 (11.13%) and T4 (9.12%), i.e., the sperm cells in the animals of T1 showed greater changes. As for sperm morphology, the number of intact cells in T4 was 6.08%, 7.53% and 12.44% higher (P < 0.05) than in T3, T2 and T1, respectively. Discussion: With respect to total motility, other authors have reported similar results, i.e., the motility of sperm was highest when collected at 7-day intervals and lower when collected at shorter intervals. Despite the statistical differences between treatments, these results were found to be similar to those recommended in the literature for use in the preparation of insemination doses. Thus, we suggest that all the intervals between collections can be used in the routine of semen production centers, since...

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Section: Discussionunclassified

Section: Introductionunclassified

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Intervals of Semen Collection from Boars during Early Reproductive Life: Evaluation of Seminal Fluid Parameters

Dornelles

Rossi

Schlösser

et al. 2019

Acta Scientiae. Vet.

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“…Therefore, boars used in insemination stations should produce ejaculates of high volume and sperm concentration (Gadea et al, 2004;Smital, 2009). Ejaculates with these characteristics allow for the production of a large number of semen doses, which is a measure of the economic efficiency of AI boars' use (Banaszewska and Kondracki, 2012;Knecht et al, 2017b). In order to achieve high production effects, the most valuable animals should be selected for use in AI stations, with the selection of the boars conducted on the basis of all available sources of information.…”

Section: Introductionmentioning

confidence: 99%

“…Previous research showed important correlations between semen quality and the daily growth rate (Knecht et al, 2017c), meat content of boars and the indicator of in-vivo evaluation (Szostak et al, 2015). According to the most recent research results (Knecht et al, 2017b), models of multiple regression, used in many other areas of animal breeding and use, should be recommended for an accurate evaluation of insemination boars (Schaeffer, 2004).…”

Section: Introductionmentioning

confidence: 99%

Evaluation and prediction of semen parameters of breeding boars and their use in stock management

Tereszkiewicz¹,

Pokrywka²,

Herbalists³

2019

Int. j. adv. appl. sci.

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Artificial insemination constitutes the main method of pig breeding in Europe. According to literature, statistical models which allow prediction of productive capacity can be used as additional tools which may be helpful in making selection decisions concerning breeding boars. The aim of the research was to evaluate the influence of boar's age, standardized daily growth rate, standardized meat content in the carcass, the number of nipples, the age when the boar starts to be used for breeding, the number of semen collections per month, and the interval between semen collections on selected qualitative and quantitative parameters of the semen and to calculate multiple regression equations, which would allow prediction of productive capacity of AI landrace boars. The material for the analysis comprised 47596 ejaculates obtained over the period 1995-2014 from 306 Polish Landrace boars. The obtained results show that semen parameters of the examined boars depend on physiological and organizational factors included in the analysis. It was observed that the following factors, measured with the number of produced semen doses, were of particular significance for the efficiency of use of the boars: boar's age, the daily growth rate, meat content in the carcass, as well as the number of collections and the interval between collections. The conducted statistical analysis points to the possibility of predicting semen parameters accurately using regression analysis. The models are characterized by very high accuracy, which points to their potential for application. The calculated determination coefficients for the multiple regression equations assumed the R 2 value of above 0.92. The highest value of the determination coefficient (R 2-0.99) was obtained for the percentage of sperm cells showing progressive motility. The calculated regression equations may be used in the management of the stock of breeding boars and when making selection decisions.

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Artificial insemination and optimization of the use of seminal doses in swine

Bortolozzo,

Zanin,

Christ

et al. 2024

Animal Reproduction Science

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The effect of age, interval collection and season on selected semen parameters and prediction of AI boars productivity

Cited by 21 publications

References 33 publications

Intervals of Semen Collection from Boars during Early Reproductive Life: Evaluation of Seminal Fluid Parameters

Intervals of Semen Collection from Boars during Early Reproductive Life: Evaluation of Seminal Fluid Parameters

Evaluation and prediction of semen parameters of breeding boars and their use in stock management

Artificial insemination and optimization of the use of seminal doses in swine

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