Calves' sex ratio in naturally and artificially bred cattle in central Ethiopia

Delesa, Effa Kefena; Yohannes, Aster; Molla, Alemayehu; Samuel, Temesgen; Yehualaeshet, Teshome

doi:10.1016/j.theriogenology.2014.04.027

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…The current findings are in agreement with findings by Bekele, (2005); Frehiwot T et al, (2014) for the increment of male calf sex born following artificial insemination in different parts of Ethiopia but the current figure is higher than the figure they reported. On the other hand in contrary to the current findings (Delesa et al, 2014) reported that there were no differences across the sexes of the calves born from artificial insemination and natural mating.…”

Section: Resultscontrasting

confidence: 99%

“…The current findings are in agreement with findings by Bekele, (2005);Frehiwot T et al, (2014) who's reported for the increment of male calf sex born following artificial insemination in different parts of Ethiopia. On the other hand in contrary to the current findings (Delesa et al, 2014) reported that there were no differences across the sexes of the calves born from artificial insemination and natural mating. XU et al, 2000 in their study on New Zealand dairy cattle indicated that only the little is known on the effect of service sire breed on secondary sex ratio and although reported that the heritability estimates of sex ratio have been 2%.…”

Section: Effect Of Breeding Methods On Sex Ratiocontrasting

confidence: 99%

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Calves Sex Ratio in Artificial and Naturally Bred Cattle at Adami Tulu Agricultural Research Center

2019

JBAH

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Breeding and calving records from 2013-2016 maintained at Adami Tulu Agricultural Research center was used for current study with aim of assessing ratios of calves born and identifying some of the factors affecting ratios of calves born. The data was cleared, arranged, categorized and pulled into years and analyzed by using Statistical Package for Social Science Version 20.0 (SPSS). The probability of a male calf being born was analyzed by chi square test. A threshold significance level was determined at the P <0.05. The result indicated that the overall sex ratio of calves born was i.e. the ratio of male to female is 57.1 to 42.9. Parity of the breeding cow doesn't have statistically significant effect on the sex ratio of calves born. The statistically analysis also shows that breeding year and season had not have the significant effect the sex ratio of calves born. In addition the sire line with which the animals inseminated has no significant effect. The result also indicted for the presence of significant difference of breeding method on sex ratio of calves born. From this it was concluded that breeding method has a significant effect on sex ratio of calves born in which number of male calves were higher in animals inseminated artificial and vice versa. Modern dairy reproductive technologies which enables to get more number of female calves has to be look into consideration to increase number of female animals for dairy producers in addition to providing efficient artificial insemination service in the country.

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Section: Resultscontrasting

confidence: 99%

Section: Effect Of Breeding Methods On Sex Ratiocontrasting

confidence: 99%

Calves Sex Ratio in Artificial and Naturally Bred Cattle at Adami Tulu Agricultural Research Center

2019

JBAH

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“…Some authors agree with the Trivers and Willard [44] sex ratio theory, which states that mothers that experienced severe environmental shocks, such us undernutrition, give birth to female calves. This mechanism could protect those fetuses having greater chances of being reproductively successful [45][46][47]. At the beginning of this study, SUBNUT dams had a negative energy balance during the first third of the heifer gestation and PI breed was more sensitive to undernutrition than PA [15].…”

Section: Heifer Reproductive Performancementioning

confidence: 99%

Effects of Developmental Programming Caused by Maternal Nutrient Intake on Postnatal Performance of Beef Heifers and Their Calves

Noya

Casasús

Ferrer

et al. 2019

Animals

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In this study, we evaluated the effects of maternal subnutrition in early pregnancy on the growth and reproductive performance of female offspring during their rearing, first gestation, and lactation. We inseminated 21 Parda and 15 Pirenaica multiparous cows and assigned them to a CONTROL (100% of nutrition requirements) or SUBNUT (65%) diet until day 82 of gestation. Cows were fed 100% requirements afterward. During the rearing of female offspring, growth, physiological profiles and ovarian follicular dynamic were studied. At 16 months old, heifers were inseminated. After first calving, dam–calf weights were recorded during lactation. Heifers born from CONTROL cows were heavier at weaning (four months old) than heifers born from SUBNUT cows, but this difference disappeared at the end of rearing and during the first gestation and lactation periods. All heifers reached puberty at a similar age and live weight. During rearing, SUBNUT heifers had higher concentrations of non-esterified fatty acids, urea, and cholesterol and a lower antral follicle count than CONTROL, but no difference was found in their fertility rate. After heifer first calving, dam–calf weights were similar among groups. In conclusion, maternal undernutrition reduced offspring postnatal gains at weaning, compromising metabolic status and follicle population during rearing but did not impair performance in the first gestation and lactation periods of beef heifers.

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“…Although concurrent records were not available the present finding suggests the necessity of monitoring the body condition of dairy cows at different physiological stage [14]. However, a comparison of artificial versus natural mating on 4657 caving events of indigenous and their crosses with Friesian and Jersey at Holeta Research Center showed that use of sire resulted in skewed male births [15]. Since reports on sex ratio are usually from breeding centers, this calls for investigation of artificial insemination under farmers' condition.…”

Section: Distribution Of Cows According To Daughters Reached To Produmentioning

confidence: 74%

Genetics of Threshold Characters and Distribution Cow Calving Traits in Holstein Friesian Cattle at Holeta Bull Dam Station, Ethiopia

Goshu¹

2017

J Vet Sci Technol

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Data collected from at Holeta Bull Dam Station from 118 sires and 902 dams were used to asses distribution of threshold traits as affected by sire variance and calving traits cows. The traits studied were type of birth (normal, abnormal), sex ratio, and female calves reached to age at first calving. Variance analyses were made to estimate effect of sire variances and repeatability of cows on the above threshold traits. The result showed that from the total of 1223 female births, 67.7% reached to productive age. Sire affected type of birth (P<0.05), sex ratio (P<0.01), and female calves reaching to productive age (P<0.0001). The distribution of calf production traits of cows showed that 30.8% of cows calved only once, 27.7% calved abnormal births at least once in their life time and 27.3% left the herd without producing any female progeny. The probability of a cow repeating abnormal birth, given the previous birth was abnormal, was very high (0.96). It is commendable to test semen for genetic disorder other than milk yield trait to expand dairy production in the country. The number of female calves reaching to productive age can be increased through introduction of sound reproductive management and improving survivability of calves.

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Calves' sex ratio in naturally and artificially bred cattle in central Ethiopia

Cited by 7 publications

References 9 publications

Calves Sex Ratio in Artificial and Naturally Bred Cattle at Adami Tulu Agricultural Research Center

Calves Sex Ratio in Artificial and Naturally Bred Cattle at Adami Tulu Agricultural Research Center

Effects of Developmental Programming Caused by Maternal Nutrient Intake on Postnatal Performance of Beef Heifers and Their Calves

Genetics of Threshold Characters and Distribution Cow Calving Traits in Holstein Friesian Cattle at Holeta Bull Dam Station, Ethiopia

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