[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as recepto...[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as receptor cows for embryo transfer and assigned into three groups ran- domly （ n = 40）. To induce estrous synchronization, the cattle in the group I were injected 4 mg prostaglandin （PG） ; those in the group II were first transplanted with vaginal embolism and then injected with 4 mg PG; and those in the group III were first transplanted with vaginal embolism and then injected with 0.4 mg PG and 2.0 ml follicle-stimulating hormone （FSH）. The rate of estrous synchronization, rate of embryo transfer and rejec- tion rate were compared between different treatments. [Result] The rates of estrous synchronization of the group I, II and III were 0%, 80% and 78%, respectively, and their rates of embryo transfer were 27.5%, 60.0% and 45.0%, respectively. [ Conclusion] Transplantation with vaginal embolism followed by injection with PG and FSH is the optimum method to induce estrus synchronization in yellow cattle.展开更多
This paper aims to study the efficiency of two short-term progestagen (FGA vs. MAP) + eCG treatments in estrus synchronization and artificial insemination (AI) with fresh or chilled semen in Assaf ewes fertility rate....This paper aims to study the efficiency of two short-term progestagen (FGA vs. MAP) + eCG treatments in estrus synchronization and artificial insemination (AI) with fresh or chilled semen in Assaf ewes fertility rate. All ewes received a subcutaneous implant of exogenous melatonin 45 days before been treated with short-term progestagens + eCG. By June 1st, ewes were divided in two groups: half was treated with an intravaginal sponge impregnated with 20 mg of FGA and the other half with an intravaginal sponge impregnated with 60 mg of MAP. Progestagen treatments lasted for 6 days. At sponge withdraw, all ewes were injected with 750 IU of eCG. Ovarian activity was assessed by plasmatic progesterone levels before and after progestagens + eCG treatment. Semen was collected by electro ejaculation and extended with Andromed? or OviXcell?. AI was performed 55 hours after eCG administration with fresh or chilled semen. During AI several factors were assessed: vagina mucosa color and lubrication, external cervical Os type, cervical mucous viscosity, semen deposition place and seminal cervix outflow. Semen was deposited as deep as possible without distress or trauma cervix mucosa. All Assaf ewes presented cyclic activity before progestagen + eCG treatments (2nd fortnight of May). Short-term progestagen + eCG treatments were equally efficient (100.0%). About 76.5% of Assaf ewes were pregnant 41 days after AI. Fertility rate was influenced by external Os type, semen deposition place and seminal cervix outflow. However, this rate was not conditioned by vaginal color or lubrication, cervical mucus viscosity, semen preservation technic and semen extender.展开更多
The results of an artificial insemination experiment carried out in the suburban area of N’Djamena are here reported. Two methods of synchronization (Norgestomet combination/estradiol/PGF2a/PMSG and PGF2a only) were ...The results of an artificial insemination experiment carried out in the suburban area of N’Djamena are here reported. Two methods of synchronization (Norgestomet combination/estradiol/PGF2a/PMSG and PGF2a only) were used with Chadian zebu and crossed breeds in 2007 and 2008. Females were inseminated after induction of estrus with semen of French Normand breed. The fertility rate was low with PGF2a (29.41%). The results obtained with the combination of several hormones were better (66.66%). The survival rates of crossbreeds were particularly low, 40% in 2007 and 33.33% in 2008, mainly due to the traditional management of the herd and the lack of technical support. The insemination cost of a cow was 39,550 F CFA in 2007 with PGF2a and 59,200 F CFA in 2008 with the method consisting of combining of four hormones. The cost of producing a calf in those two years was very high, 134,470 F CFA in 2007 and 118,400 F CFA in 2008.展开更多
[Objectives] The aim was to improve and stabilize the estrus synchronization of local sheep in Xinjiang during the breeding season and non-breeding season. [Methods]The data of estrus rate and estrus concentration tim...[Objectives] The aim was to improve and stabilize the estrus synchronization of local sheep in Xinjiang during the breeding season and non-breeding season. [Methods]The data of estrus rate and estrus concentration time were analyzed by different hormone treatment programs. [Results]eding season,whether PMSC was used did not affect the estrus of sheep when sponge and PG were used（ P 〉 0. 05）. Estrus was concentrated in 36-48 h after sponge plugs were removed,and the estrus rate in this period accounted for 74. 19% of the total. In non-breeding season,the estrus rate in the sponge plug plus PGF treatment was only56. 12%,significantly lower than that（ 90. 43%） in the sponge plug plus PG plus PMSG treatment（ P 〈 0. 01）. The estrus was also concentrated in 36-48 h after sponge plugs were removed. The estrus rate at this stage was 67. 42%,accounting for 82. 8% of the total. In breeding season,the estrus rate in sheep injected with333 IU of PMSG（ 81. 96%） was significantly lower than those of sheep injected with 500（ 90. 25%） and 750 IU（ 95. 3%）（ P 〈 0. 05）. [Conclusions] This study provides a theoretical basis for the production enterprises to save a lot of manpower and material resources.展开更多
To compare the fertility results and to assess the cost-effectiveness of several synchronization protocols applied under the conditions of beef cattle enterprises in Colombia, 1658 multiparous zebu crossbred cows most...To compare the fertility results and to assess the cost-effectiveness of several synchronization protocols applied under the conditions of beef cattle enterprises in Colombia, 1658 multiparous zebu crossbred cows mostly Brahman and Nelore ranging between 2 - 6 parities were used. Five protocols of pharmacological treatments varying in hormones used, dosage and the time of application were tested. All cows were inseminated at 52 h by appointment. Pregnancy diagnosis was undertaken over 45 d after insemination by rectal palpation. The total cost per cow and the total cost per gestation, for each protocol, were calculated. Taking a herd of one-hundred cows as baseline for calculations, it was estimated the cost of the total amount of pregnancies possibly obtained in each protocol;then, the excess between the costs of a pregnant cow and the cost of a treated cow was estimated. Additionally, the costs due to cows empty after four services were calculated. A total of 874 pregnancies were registered (52.7%), with pregnancies per protocol varying between 46.9% and 66.2% (p < 005). The cost per treated cow, varied between $64.08 and $97.47 and the cost per gestation from $126.01 to $177.26, without association between the cost of the treatment and the pregnancy rate. Protocol A was the best cost-effective with the lowest additional costs, the lowest amount of open days (2107.7 to 2231.7 d) and IA straws (average = 134), with an additional costs of $6940.00. Synchronization of estrus using pharmacological products seems to have a place in the management of cattle;however, caution should be called upon a careful assessment both from the part of the farm and the professional in charge of the enterprise to avoid using the technique indiscriminatively thus propitiating the use of a method that might not be cost efficient.展开更多
The aim of this study was to assess the overall management practice and comparison of reproductive and productive performance between beneficiaries and none beneficiaries of oestrus synchronization and mass inseminati...The aim of this study was to assess the overall management practice and comparison of reproductive and productive performance between beneficiaries and none beneficiaries of oestrus synchronization and mass insemination(OSMI)of dairy cattle in north shewa zone of dairy cattle.Data were obtained by interviewing 270 estrus synchronization and mass insemination beneficiaries and 135 none beneficiaries’dairy farmers.Data were analyzed using Statistical Packaging for social science(SPSS)version 20.Natural pasture and crop residue were the most common feed resources in the study areas.River water was the major source of water for their cattle and well water was used when river water is not available.In their order of importance;FMD,mastitis,and abortion were the major diseases of cattle in the study area.The reproductive performance of dairy cows in OSMI beneficiaries were age at first service(30.81±7.6),calving interval(6.9±5.2),lactation length(8.95±2.46),day open(5.3±3.18)and number of service per conception(1.5±0.38)whereas in none beneficiary age at first service(32.88±6.64),calving interval(18.18±5.8),lactation length(9.6±0.54),day open(5.17±3.43)and number of service per conception(1.22±0.54)months.There was a significant(p<0.05)difference in milk yield between beneficiaries and none beneficiaries in HFC,HHFC and JERC dairy cows per day per cow.The major factors affecting reproductive performance of dairy cows are management,nutritional status,genotype,and disease.Therefor the productive and reproductive performance of the dairy cows reared by the participants were better than those of the nonparticipants.展开更多
文摘[ Objective] To find an efficient and low-consumption estrus synchronization method and thus to provide the basis for embryo transfer. [Method] A total of 120 healthy multiparous yellow cattle were selected as receptor cows for embryo transfer and assigned into three groups ran- domly （ n = 40）. To induce estrous synchronization, the cattle in the group I were injected 4 mg prostaglandin （PG） ; those in the group II were first transplanted with vaginal embolism and then injected with 4 mg PG; and those in the group III were first transplanted with vaginal embolism and then injected with 0.4 mg PG and 2.0 ml follicle-stimulating hormone （FSH）. The rate of estrous synchronization, rate of embryo transfer and rejec- tion rate were compared between different treatments. [Result] The rates of estrous synchronization of the group I, II and III were 0%, 80% and 78%, respectively, and their rates of embryo transfer were 27.5%, 60.0% and 45.0%, respectively. [ Conclusion] Transplantation with vaginal embolism followed by injection with PG and FSH is the optimum method to induce estrus synchronization in yellow cattle.
文摘This paper aims to study the efficiency of two short-term progestagen (FGA vs. MAP) + eCG treatments in estrus synchronization and artificial insemination (AI) with fresh or chilled semen in Assaf ewes fertility rate. All ewes received a subcutaneous implant of exogenous melatonin 45 days before been treated with short-term progestagens + eCG. By June 1st, ewes were divided in two groups: half was treated with an intravaginal sponge impregnated with 20 mg of FGA and the other half with an intravaginal sponge impregnated with 60 mg of MAP. Progestagen treatments lasted for 6 days. At sponge withdraw, all ewes were injected with 750 IU of eCG. Ovarian activity was assessed by plasmatic progesterone levels before and after progestagens + eCG treatment. Semen was collected by electro ejaculation and extended with Andromed? or OviXcell?. AI was performed 55 hours after eCG administration with fresh or chilled semen. During AI several factors were assessed: vagina mucosa color and lubrication, external cervical Os type, cervical mucous viscosity, semen deposition place and seminal cervix outflow. Semen was deposited as deep as possible without distress or trauma cervix mucosa. All Assaf ewes presented cyclic activity before progestagen + eCG treatments (2nd fortnight of May). Short-term progestagen + eCG treatments were equally efficient (100.0%). About 76.5% of Assaf ewes were pregnant 41 days after AI. Fertility rate was influenced by external Os type, semen deposition place and seminal cervix outflow. However, this rate was not conditioned by vaginal color or lubrication, cervical mucus viscosity, semen preservation technic and semen extender.
文摘The results of an artificial insemination experiment carried out in the suburban area of N’Djamena are here reported. Two methods of synchronization (Norgestomet combination/estradiol/PGF2a/PMSG and PGF2a only) were used with Chadian zebu and crossed breeds in 2007 and 2008. Females were inseminated after induction of estrus with semen of French Normand breed. The fertility rate was low with PGF2a (29.41%). The results obtained with the combination of several hormones were better (66.66%). The survival rates of crossbreeds were particularly low, 40% in 2007 and 33.33% in 2008, mainly due to the traditional management of the herd and the lack of technical support. The insemination cost of a cow was 39,550 F CFA in 2007 with PGF2a and 59,200 F CFA in 2008 with the method consisting of combining of four hormones. The cost of producing a calf in those two years was very high, 134,470 F CFA in 2007 and 118,400 F CFA in 2008.
基金Supported by Nonprofit Institute Research Grant of Autonomous Region(KY2017008)Guiding Fund Project for Scientific and Technological Innovation in Inner Mongolia Autonomous Region+1 种基金Meat Sheep Industry Engineering Technology Research Center of Inner Mongolia Autonomous RegionDorper×Mongolia Sheep Breeding and Industrialization
文摘[Objectives] The aim was to improve and stabilize the estrus synchronization of local sheep in Xinjiang during the breeding season and non-breeding season. [Methods]The data of estrus rate and estrus concentration time were analyzed by different hormone treatment programs. [Results]eding season,whether PMSC was used did not affect the estrus of sheep when sponge and PG were used（ P 〉 0. 05）. Estrus was concentrated in 36-48 h after sponge plugs were removed,and the estrus rate in this period accounted for 74. 19% of the total. In non-breeding season,the estrus rate in the sponge plug plus PGF treatment was only56. 12%,significantly lower than that（ 90. 43%） in the sponge plug plus PG plus PMSG treatment（ P 〈 0. 01）. The estrus was also concentrated in 36-48 h after sponge plugs were removed. The estrus rate at this stage was 67. 42%,accounting for 82. 8% of the total. In breeding season,the estrus rate in sheep injected with333 IU of PMSG（ 81. 96%） was significantly lower than those of sheep injected with 500（ 90. 25%） and 750 IU（ 95. 3%）（ P 〈 0. 05）. [Conclusions] This study provides a theoretical basis for the production enterprises to save a lot of manpower and material resources.
文摘To compare the fertility results and to assess the cost-effectiveness of several synchronization protocols applied under the conditions of beef cattle enterprises in Colombia, 1658 multiparous zebu crossbred cows mostly Brahman and Nelore ranging between 2 - 6 parities were used. Five protocols of pharmacological treatments varying in hormones used, dosage and the time of application were tested. All cows were inseminated at 52 h by appointment. Pregnancy diagnosis was undertaken over 45 d after insemination by rectal palpation. The total cost per cow and the total cost per gestation, for each protocol, were calculated. Taking a herd of one-hundred cows as baseline for calculations, it was estimated the cost of the total amount of pregnancies possibly obtained in each protocol;then, the excess between the costs of a pregnant cow and the cost of a treated cow was estimated. Additionally, the costs due to cows empty after four services were calculated. A total of 874 pregnancies were registered (52.7%), with pregnancies per protocol varying between 46.9% and 66.2% (p < 005). The cost per treated cow, varied between $64.08 and $97.47 and the cost per gestation from $126.01 to $177.26, without association between the cost of the treatment and the pregnancy rate. Protocol A was the best cost-effective with the lowest additional costs, the lowest amount of open days (2107.7 to 2231.7 d) and IA straws (average = 134), with an additional costs of $6940.00. Synchronization of estrus using pharmacological products seems to have a place in the management of cattle;however, caution should be called upon a careful assessment both from the part of the farm and the professional in charge of the enterprise to avoid using the technique indiscriminatively thus propitiating the use of a method that might not be cost efficient.
文摘The aim of this study was to assess the overall management practice and comparison of reproductive and productive performance between beneficiaries and none beneficiaries of oestrus synchronization and mass insemination(OSMI)of dairy cattle in north shewa zone of dairy cattle.Data were obtained by interviewing 270 estrus synchronization and mass insemination beneficiaries and 135 none beneficiaries’dairy farmers.Data were analyzed using Statistical Packaging for social science(SPSS)version 20.Natural pasture and crop residue were the most common feed resources in the study areas.River water was the major source of water for their cattle and well water was used when river water is not available.In their order of importance;FMD,mastitis,and abortion were the major diseases of cattle in the study area.The reproductive performance of dairy cows in OSMI beneficiaries were age at first service(30.81±7.6),calving interval(6.9±5.2),lactation length(8.95±2.46),day open(5.3±3.18)and number of service per conception(1.5±0.38)whereas in none beneficiary age at first service(32.88±6.64),calving interval(18.18±5.8),lactation length(9.6±0.54),day open(5.17±3.43)and number of service per conception(1.22±0.54)months.There was a significant(p<0.05)difference in milk yield between beneficiaries and none beneficiaries in HFC,HHFC and JERC dairy cows per day per cow.The major factors affecting reproductive performance of dairy cows are management,nutritional status,genotype,and disease.Therefor the productive and reproductive performance of the dairy cows reared by the participants were better than those of the nonparticipants.
