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Print version ISSN 1516-8913
Braz. arch. biol. technol. vol.55 no.3 Curitiba May/June 2012
HUMAN AND ANIMAL HEALTH
Ciro MeirellesI; Luiz Ernandes KozickiI, *; Romildo Romualdo WeissII; Marcio Saporski SeguiI; Antonio SouzaIII; Ivo Walter dos SantosII; Jose Carlos dos Santos BredaIV
IVeterinarian and Professor at the Pontifical University Catholic of Paraná
IIVeterinarian and Professor at the Federal University of Paraná
IIIVeterinarian - Vet-Maxi Maximization Livestock Ltd
IVVeterinary and Master's Graduate Program in Animal Science
This study aimed to compare the pregnancy rate using the conventional artificial insemination (AI) or deep intracornual artificial insemination (DIAI), with low number of spermatozoa (4.0 million sperm) in 270 Nelore cows. The animals were divided in two groups (G: G1 (135 cows) conventional AI was performed (=semen deposition in the uterine body) and in G2 (135 cows) to DIAI, in ipsilateral horn where the dominant follicle in the ovary had previously been detected, by ultrasound examinations. For both the methods, a single artificial insemination was carried out after visual estrus observation, checked three times a day (morning, afternoon and evening). The pregnancy diagnosis after 45 days was conducted by ultrasound. Results showed a better pregnancy rate in the DIAI group (67.4% - p<0.01), when compared to conventional AI (48.8%) with low spermatozoa concentration.
Key words: Deep intracornual artificial insemination, Beef cattle, Artificial insemination, Nelore cows
The modernization and intensification of cattle production is a dynamic process including the improvement of the quality and quantity of animal products. Hunter and Greve (1998) reported that a better understanding of reproductive anatomy and physiology (transportation and survival of gametes), and others processes involved in fertilization, would allow to develop more efficient procedures for AI. There's no doubt about the benefits of semen deposition in the uterine body as compared to deposition in the cervix. However, there are doubts about the best location for the deposition of semen after the cervix (Lopez-Gatius 2000). According to Hawk et al. (1983), Larsson and Larsson (1985), Nelson (1987) and Seidel Jr et al. (1999) the deposition of semen near to the uterus-tubal junction could reduce the spermatic loss, either by the retrograde flow of uterine mucus, or by the phagocytosis during uterine migration. Hawk and Tanabe (1986) inseminated cows by the conventional AI and by DIAI, setting the semen in the middle of the uterine horn, but no significant differences between both the methods were found. Dalton et al. (1999) found that the fertilization of oocytes in the tubes was favored in bilateral DIAI, when the semen was deposited in the middle portion of the horn. Lopez-Gatius and Camon (1988) reported that the semen deposited near to the uterus-tubal junction, reduced the loss of sperm, improving the pregnancy rate by 10.3%. Senger et al. (1988) reported good results with the bilateral DIAI, using half-dose of the semen placed deep into the two uterine horns, resulting in 44.7% in conventional AI against 64.7% in DIAI. According to Lopez-Gatius (2000), the greatest advantage of DIAI was related to its use by professionals, obtaining higher percentage on animal's pregnancy, since the number of sperm would be greatly reduced, e.g., in AI with sexed semen (Schenk et al. 2006; Borchersen and Peacock 2009; DeJarnette et al. 2009; Larson et al. 2010; Campanile et al. 2011).Verberckmoes et al. (2005) performed the AI with different quantities of frozen semen (2, 4, 8 to 12 million total sperm), setting the sperm into the body or in uterine horn, but no significant difference in the pregnancy rate was found. Anderson et al. (2004) reported that a concentration of two million total cells per insemination significantly affected the pregnancy rate, when the semen in the uterus body was deposited. Kurykin et al. (2006) showed tendency to increase the pregnancy rate after DIAI in the cows using two million of spermatozoa comparing the semen placement in the middle of the horn. Seidel Jr and Schenk (2008) compared bilateral DIAI (half dose in each uterine horn) versus the conventional AI (uterine body); the results very similar with a concentration of three million sexed sperm in relation to pregnancy rate (44% in the uterine body and 43% in the uterine horn). In another experiment, a significant difference was observed in lactating Angus cows after bilateral AI in the uterine horns using three million spermatozoa compared with 20 million in the uterine body, resulting in 50% and 76% of pregnancy rate, respectively (Schenk and Seidel, 2007).
This study aimed to the compare pregnancy rate between the conventional AI and the DIAI using reduced spermatozoa concentration in beef cattle.
MATERIAL AND METHODS
This study was performed in Western of Parana State (Brazil). The body condition score ranging from 2.5 to 3.5 according Edmonson et al. (1989) (score 1=animal very thin and 5 obese). All the animals were submitted to identical management practices and the nutrition was composed by Brachiaria decumbens, and mineral supplementation ad libitum. The AI was performed by the same professional operator (veterinary) after observing the estrus, checking three times a day (morning, afternoon and evening). All the animals received an unique insemination with frozen bull semen from the same bull and batch. The average spermatozoa concentration was 4000000±486000 per insemination. The animals were divided in two groups (G): G1 (135 cows) which were submitted to conventional artificial insemination (semen deposition in the uterine body) and G2 (135 animals) which received the deep intracornual artificial insemination (DIAI) in the same side where was located the dominant follicle by ultrasound examinations. The conventional AI and the DIAI was performed by a catheter 65.0 cm length (Minitub Co ®, Germany) by transcervical way. For DIAI, the catheter extremity was touched to be sure its deepest location by rectal palpation in the ipsilateral horn, where the dominant follicle was found by ultrasonography before the semen deposition. Pregnancy diagnosis was performed after 45 days of AI by ultrasound examination.
In order to verify the pregnancy rate between the conventional AI and the DIAI, the Fisher's exact test at the level of p<0.01 was carried out.
RESULTS AND DISCUSSION
The results are shown in Table 1. Lopez-Gatius and Camon (1988) reported that semen placed near to the uterus-tubal junction, reduced the loss of sperm and improved the pregnancy rate by 10.3%, when compared with the deposition of semen in the uterine body. The present results showed 18.6% improvement in the pregnancy rate (Table 1) when DIAI was carried out. Senger et al. (1988) reported good results with the bilateral DIAI, using half-dose semen deposited deep into the two uterine horns, performing 44.7% in conventional AI against 64.7% in DIAI; similar results were obtained in this study. Hawk and Tanabe (1986) studying the pregnancy rate in the conventional AI and DIAI, placed the semen in the middle of the horn when no significant differences between the techniques were found. Later, Dalton et al. (1999) concluded that the fertilization of oocytes in the uterine tubes was improved in bilateral DIAI, compared to the semen deposition in the middle portion of the horn. Lopez-Gatius (2000) reported that the great advantage using the DIAI would be its use by the experimented people, resulting in a higher percentage of pregnancy rate in the cows, where the number of spermatozoa could be greatly reduced.
Seidel Jr and Schenk (2008) compared bilateral DIAI (half dose in each uterine horn) versus the conventional AI (uterine body) and obtained very similar results with a concentration of three million sperm in relation to pregnancy rate (44% in the uterine body and 43% in the uterine horn). In the present study, a higher level of pregnancy was achieved when the DIAI was used, probably due a higher number of sperm cells used in this experiment (four million spermatozoa). Verberckmoes et al. (2005) studied different quantity of frozen semen (2, 4, 8 to 12 million total spermatozoa), putting the sperm into the body or in the uterine horn, but no significant difference in the pregnancy rate were found. Anderson et al. (2004) found that a concentration of two million sperm cells significantly affected the pregnancy rate, when the semen in the uterus body was deposited. Kurykin et al. (2006) showed tendency to increase the pregnancy rate after DIAI in the cows using two million sperm compared to the deposition in the middle of the horn.
Besides the aspects already discussed, the DIAI technique could be considered as a promising tool for bovine and buffaloes reproduction using the sexed semen. The sexed semen is commercially produced and tested, and moreover contains small portions of sperm in a straw (about two million sperm) (Schenk et al. 2006; Borchersen and Peacock 2009; DeJarnette et al. 2009, Larson et al. 2010). That meant that the DIAI could be widely used by the producers. DIAI could also be explored in the protocols for ovarian superovulation in embryo collection (for embryo transfer) using the sexed semen (Schenk et al. 2006; Larson et al. 2010; Campanile et al. 2011), since farmer would have to choose between the male calves (for beef cattle) or female calves in dairy cattle (for milk) (Hohenboken 1999), according to the satisfaction of the producer's desire.
To conclude the present results showed a better pregnancy rate in DIAI in comparison to the conventional AI when reduced number of spermatozoa was used.
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Received: March 01, 2011
Revised: July 13, 2011
Accepted: February 14, 2012.