Optimizing the use of sex-sorted sperm in timed artificial insemination programs for suckled beef cows1

Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramusc...

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Published in:Journal of animal science 2012-06, Vol.90 (6), p.1816-1823
Main Authors: Sá Filho, M. F., Girotto, R., Abe, E. K., Penteado, L., Campos Filho, E. P., Moreno, J. F., Sala, R. V., Nichi, M., Baruselli, P. S.
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Animal reproduction
Artificial insemination
Breeding of animals
Cattle
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creator Sá Filho, M. F.
Girotto, R.
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Nichi, M.
Baruselli, P. S.
description Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramuscular estradiol benzoate (EB) at device insertion. The females received PG and eCG (300 IU) at P4 device removal and 1.0 mg of EB 24 h later. The cows were inseminated 60 to 64 h after P4 device withdrawal. All cows had their ovaries scanned by transrectal ultrasound at TAI to identify and to measure the largest follicle (LF) present. In Exp. 1, a total of 853 cows had their LF classified as
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F. ; Girotto, R. ; Abe, E. K. ; Penteado, L. ; Campos Filho, E. P. ; Moreno, J. F. ; Sala, R. V. ; Nichi, M. ; Baruselli, P. S.</creator><creatorcontrib>Sá Filho, M. F. ; Girotto, R. ; Abe, E. K. ; Penteado, L. ; Campos Filho, E. P. ; Moreno, J. F. ; Sala, R. V. ; Nichi, M. ; Baruselli, P. S.</creatorcontrib><description><![CDATA[Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramuscular estradiol benzoate (EB) at device insertion. The females received PG and eCG (300 IU) at P4 device removal and 1.0 mg of EB 24 h later. The cows were inseminated 60 to 64 h after P4 device withdrawal. All cows had their ovaries scanned by transrectal ultrasound at TAI to identify and to measure the largest follicle (LF) present. In Exp. 1, a total of 853 cows had their LF classified as <9 mm or ≥9 mm at the time of TAI; these cows were then randomly assigned to 4 groups according to their LF diameter (<9 mm or ≥9 mm) and the type of sperm used (sex-sorted or non-sex-sorted). There was an interaction (P = 0.02) between the type of sperm and LF diameter beginning at TAI[non-sex-sorted <9 mm = 58.9%supa (126/214); non-sex-sorted <9 mm = 495%supb (106/214);sex-sorted >9 mm = 568%supab (134/236); and sex-sorted <9 mm = 31.2%supc (59/189), means without a common superscript differ; P < 0.05]. In Exp. 2, suckled cows (n = 491) were classified immediately before TAI as having displayed estrus or not (estrus or no estrus) between P4 device removal and TAI. These cows were randomly assigned to 4 groups according to the occurrence of estrus and the type of sperm (sex-sorted or non-sex-sorted). There were effects of the occurrence of estrus (P = 0.0003) and the type of sperm (P = 0.05) on pregnancy per Al [P/AI; no estrus, non-sex-sorted = 43.6% (27/62); estrus, non-sex-sorted = 58.5%; (107/1 83); no estrus, sex-sorted = 33.9% (2 1/62), and estrus, sex-sorted = 50.0% (92/184)]; however, no interaction between the occurrence of estrus and type of sperm was observed (P = 0.87). In Exp. 3, a total of 200 suckled cows presenting LF ≥9 mm at TAI were randomly assigned to receive sex-sorted sperm deposited into the uterine body (n = 100) or into the uterine horn ipsilateral to the recorded LF (n = 100). No effect of deeper AI on P/AI was found (P = 0.57). Therefore, the LF diameter at TAI and the occurrence of estrus can be used as selection criteria to identify cows with greater odds of pregnancy to receive sex-sorted sperm in TAI programs. In addition, performing TAI with sex-sorted sperm deeper into the uterus did not alter the pregnancy results. 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The females received PG and eCG (300 IU) at P4 device removal and 1.0 mg of EB 24 h later. The cows were inseminated 60 to 64 h after P4 device withdrawal. All cows had their ovaries scanned by transrectal ultrasound at TAI to identify and to measure the largest follicle (LF) present. In Exp. 1, a total of 853 cows had their LF classified as <9 mm or ≥9 mm at the time of TAI; these cows were then randomly assigned to 4 groups according to their LF diameter (<9 mm or ≥9 mm) and the type of sperm used (sex-sorted or non-sex-sorted). There was an interaction (P = 0.02) between the type of sperm and LF diameter beginning at TAI[non-sex-sorted <9 mm = 58.9%supa (126/214); non-sex-sorted <9 mm = 495%supb (106/214);sex-sorted >9 mm = 568%supab (134/236); and sex-sorted <9 mm = 31.2%supc (59/189), means without a common superscript differ; P < 0.05]. 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F.</au><au>Girotto, R.</au><au>Abe, E. K.</au><au>Penteado, L.</au><au>Campos Filho, E. P.</au><au>Moreno, J. F.</au><au>Sala, R. V.</au><au>Nichi, M.</au><au>Baruselli, P. S.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Optimizing the use of sex-sorted sperm in timed artificial insemination programs for suckled beef cows1</atitle><jtitle>Journal of animal science</jtitle><date>2012-06-01</date><risdate>2012</risdate><volume>90</volume><issue>6</issue><spage>1816</spage><epage>1823</epage><pages>1816-1823</pages><issn>0021-8812</issn><eissn>1525-3163</eissn><abstract><![CDATA[Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramuscular estradiol benzoate (EB) at device insertion. The females received PG and eCG (300 IU) at P4 device removal and 1.0 mg of EB 24 h later. The cows were inseminated 60 to 64 h after P4 device withdrawal. All cows had their ovaries scanned by transrectal ultrasound at TAI to identify and to measure the largest follicle (LF) present. In Exp. 1, a total of 853 cows had their LF classified as <9 mm or ≥9 mm at the time of TAI; these cows were then randomly assigned to 4 groups according to their LF diameter (<9 mm or ≥9 mm) and the type of sperm used (sex-sorted or non-sex-sorted). There was an interaction (P = 0.02) between the type of sperm and LF diameter beginning at TAI[non-sex-sorted <9 mm = 58.9%supa (126/214); non-sex-sorted <9 mm = 495%supb (106/214);sex-sorted >9 mm = 568%supab (134/236); and sex-sorted <9 mm = 31.2%supc (59/189), means without a common superscript differ; P < 0.05]. In Exp. 2, suckled cows (n = 491) were classified immediately before TAI as having displayed estrus or not (estrus or no estrus) between P4 device removal and TAI. These cows were randomly assigned to 4 groups according to the occurrence of estrus and the type of sperm (sex-sorted or non-sex-sorted). There were effects of the occurrence of estrus (P = 0.0003) and the type of sperm (P = 0.05) on pregnancy per Al [P/AI; no estrus, non-sex-sorted = 43.6% (27/62); estrus, non-sex-sorted = 58.5%; (107/1 83); no estrus, sex-sorted = 33.9% (2 1/62), and estrus, sex-sorted = 50.0% (92/184)]; however, no interaction between the occurrence of estrus and type of sperm was observed (P = 0.87). In Exp. 3, a total of 200 suckled cows presenting LF ≥9 mm at TAI were randomly assigned to receive sex-sorted sperm deposited into the uterine body (n = 100) or into the uterine horn ipsilateral to the recorded LF (n = 100). No effect of deeper AI on P/AI was found (P = 0.57). Therefore, the LF diameter at TAI and the occurrence of estrus can be used as selection criteria to identify cows with greater odds of pregnancy to receive sex-sorted sperm in TAI programs. In addition, performing TAI with sex-sorted sperm deeper into the uterus did not alter the pregnancy results. [PUBLICATION ABSTRACT]]]></abstract><cop>Champaign</cop><pub>Oxford University Press</pub><doi>10.2527/jas.2011-4523</doi><tpages>8</tpages></addata></record>
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subjects Animal reproduction
Artificial insemination
Breeding of animals
Cattle
title Optimizing the use of sex-sorted sperm in timed artificial insemination programs for suckled beef cows1
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