scholarly journals Genomic Evaluation of Primiparous High-Producing Dairy Cows: Inbreeding Effects on Genotypic and Phenotypic Production–Reproductive Traits

Animals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1704
Author(s):  
Miguel A. Gutiérrez-Reinoso ◽  
Pedro Manuel Aponte ◽  
Joel Cabezas ◽  
Lleretny Rodriguez-Alvarez ◽  
Manuel Garcia-Herreros
Keyword(s):  
Dairy Cows ◽  
Protein Production ◽  
Reproductive Traits ◽  
Reproductive Parameters ◽  
Negative Effects ◽  
Calving Ease ◽  
Holstein Friesian ◽  
Days Open ◽  
Total Fat

The main objective of this study was to analyze the effects of the inbreeding degree in high-producing primiparous dairy cows genotypically and phenotypically evaluated and its impacts on production and reproductive parameters. Eighty Holstein–Friesian primiparous cows (age: ~26 months; ~450 kg body weight) were previously genomically analyzed to determine the Inbreeding Index (II) and were divided into two groups: low inbreeding group (LI: <2.5; n = 40) and high inbreeding group (HI: ≥2.5 and ≤5.0; n = 40). Genomic determinations of production and reproductive parameters (14 in total), together with analyses of production (12) and reproductive (11) phenotypic parameters (23 in total) were carried out. Statistically significant differences were obtained between groups concerning the genomic parameters of Milk Production at 305 d and Protein Production at 305 d and the reproductive parameter Daughter Calving Ease, the first two being higher in cows of the HI group and the third lower in the LI group (p < 0.05). For the production phenotypic parameters, statistically significant differences were observed between both groups in the Total Fat, Total Protein, and Urea parameters, the first two being higher in the LI group (p < 0.05). Also, significant differences were observed in several reproductive phenotypic parameters, such as Number of Services per Conception, Calving to Conception Interval, Days Open Post Service, and Current Inter-Partum Period, all of which negatively influenced the HI group (p < 0.05). In addition, correlation analyses were performed between production and reproductive genomic parameters separately and in each consanguinity group. The results showed multiple positive and negative correlations between the production and reproductive parameters independently of the group analyzed, being these correlations more remarkable for the reproductive parameters in the LI group and the production parameters in the HI group (p < 0.05). In conclusion, the degree of inbreeding significantly influenced the results, affecting different genomic and phenotypic production and reproductive parameters in high-producing primiparous cows. The determination of the II in first-calf heifers is crucial to evaluate the negative effects associated with homozygosity avoiding an increase in inbreeding depression on production and reproductive traits.

scholarly journals Influence of GnRH-gonadoreline and prostaglandine F2α-dinoprost application on reproduction parameter values in dairy cows with puerperal endometritis

2009 ◽  
Vol 63 (5-6) ◽  
pp. 269-283
Author(s):  
Mustafa Sabanovic ◽  
Nevres Paprikic ◽  
Ahmet Suljkanovic ◽  
Jako Miljas ◽  
Miodrag Lazarevic
Keyword(s):  
Dairy Cows ◽  
Post Partum ◽  
Hormonal Treatment ◽  
Conception Rate ◽  
Reproductive Parameters ◽  
Control Groups ◽  
Holstein Friesian ◽  
Parameter Values ◽  
Friesian Cows

This paper presents results of investigations of gonadoreline application (14-16, 17-20 and 21-25 days post partum) influence, followed by prostaglanin F2 ? ten days later, on the reproductive parameters of dairy cows with difficult calving and endometritis. The study was carried out on a total of 92 Holstein-Friesian cows. Fifty of them treated with hormones, while 42 animals served as controls, receiving placebo injections. Analysis of the results in cows with postpartal endometrits revealed that mean anoestrus period, open days period and intervals between calving were significantly lower in cows that underwent hormonal treatment, when compared to the controls. The period from gonadoreline application, followed by prostaglandin injection, to conception was shorter by 44, 28 and 14 days respectively when compared to the control groups. The total conception rate from the first three artificial inseminations was higher in the experimental groups in comparison to the controls. .

scholarly journals Türkiye’de Yetiştirilen Holştayn İneklerde Döl Verim Özelliklerine Ait Fenotipik ve Genotipik Parametre Tahminleri

2017 ◽  
Vol 5 (12) ◽  
pp. 1476
Author(s):  
Ahmet Derviş Sarar ◽  
İbrahim Tapkı
Keyword(s):  
Reproductive Traits ◽  
Interval Number ◽  
Calving Interval ◽  
Reproductive Parameters ◽  
State Farm ◽  
Service Period ◽  
Holstein Friesian ◽  
Friesian Cows ◽  
Estimated Heritability

In this study, reproductive parameters of Holstein Friesian cows raised at Koçaş State Farm were investigated. Average, first breeding age, first calving age, calving interval, number of insemination per gestation and service period were found as, 529,66, 849,59, 378,61 d, 1,92 times and 105,67 d respectively. Also, estimated heritability values of same traits were as 0,30, 0,20, 0,02, 0,09 and 0,11 respectively. The effects of year, season and lactation number on services insemination per pregnancy; the effects of year on calving interval and first breeding age were found significantly. In conclusion, data of reproductive traits of Holstein Friesian cows in raised Koçaş State Farm herd were determined well condition and the estimated phenotypic and genotypic parameters are within reasonable limits.

scholarly journals The influence of calf rearing methods and milking methods on performance traits of crossbred dairy cattle in Thailand – 2. Reproductive performance and cow body weight

2004 ◽  
Vol 47 (4) ◽  
pp. 303-312
Author(s):  
N. Boonbrahm ◽  
K. J. Peters ◽  
W. Intisang
Keyword(s):  
Body Weight ◽  
Dairy Cows ◽  
Reproductive Performance ◽  
Body Weight Change ◽  
Experimental Animals ◽  
Machine Milking ◽  
Holstein Friesian ◽  
Days Open ◽  
Rearing Methods ◽  
Calf Rearing

Abstract. Forty Thai x Holstein-Friesian (HF) crossbred dairy cows (75 % and 87.5 % HF upgrade level) with calves were used in experiments to investigate restricted suckling (RS) versus bucket rearing (BR) and hand versus machine milking in Thailand. Calves were kept indoors and remained with their dams during the first 4 days and were then allocated to the RS or BS treatment. Milking was done twice daily and RS-calves were allowed to suckle for 15 minutes after milking. All experimental animals were fed according to requirements with concentrate supplements, minerals and water ad lib. This paper reports effects on reproductive performance and weight of cows. Calving to first oestrus interval in cows with RS and BR calves were 72.2 ± 2.5 and 54.7 ± 2.5 (p < 0.001), respectively, and days open 114.2 ± 6.68 and 86.5 ± 6.7 (p < 0.01). Milking method (hand or machine) had no effect on days to first oestrus and days open. Primiparous cows had a longer calving to first oestrus interval than multiparous cows (p < 0.001) (72.3 ± 2.8 vs 54.5 ± 2.3) and a longer days open period (p < 0.01) (114.4 ± 7.4 vs 86.2 ± 6.1). Body weight change of cows during the first 2 months of lactation was not affected by any treatment or systematic factor tested.

Comparative reproductive performance evaluation of Holstein Friesian cattle breeds in two different agro ecological conditions, Oromia region, Ethiopia

2016 ◽  
Vol 58 ◽  
pp. 31-42
Author(s):  
Destaw Worku ◽  
Kefyalew Alemayehu ◽  
Mussie H/Melekote
Keyword(s):  
Reproductive Performance ◽  
Detection System ◽  
Dairy Farm ◽  
Reproductive Traits ◽  
Least Square ◽  
Standard Errors ◽  
Holstein Friesian ◽  
Estrus Detection ◽  
Days Open ◽  
Friesian Cattle

SummaryComparative study was conducted at Alage and Ardaita Agricultural Technical and Vocational Education Training College dairy farm to evaluate the reproductive performance of Holstein Friesian (HF) and associated factors in the two farms. The data collected from 2000 to 2015 on reproductive traits (n= 1688) were analyzed using general linear model procedures of SAS version 9.2 (SAS, 2008). The result revealed that an overall least square means and standard errors for Age at first Service (AFS), Age at first calving (AFC), Calving interval (CI), Days open (DO) and Number of services per conception were 29.70 ± 0.49 months, 39.75 ± 0.53 months, 465.76 ± 7.22 days, 188.11 ± 7.22 days and 1.31 ± 0.04, respectively. AFC was significantly influenced by agro ecology (P&lt; 0.001) and year of birth (P&lt; 0.01). Besides this, agro ecology (P&lt; 0.001) and year of birth (P&lt; 0.05) was significantly influenced by AFC. Year of calving and parity had significant effect (P&lt; 0.001) on CI and DO. Except CI, agro ecology had significant effect on all traits. Service per conception was significantly influenced by agro ecology (P&lt; 0.05) and year of calving (P&lt; 0.01). Season of birth and season of calving was not significant on all reproductive traits. Except SPC, the result obtained for AFS, AFC, CI and DO were below the standard expected from commercial dairy farm. Poor efficiency of estrus detection and expression were the most probable management factors accounted for longer period of AFS, AFC, CI and DO. Improving the level of nutrition as well as efficiency of estrus detection system is required for optimal reproduction performance of HF breed in the area.

scholarly journals Effect of some non-genetic factors on the productivity and profitability of Holstein Friesian dairy cows

2021 ◽  
Vol 14 (1) ◽  
pp. 242-249
Author(s):  
Amira M. Abd-El Hamed ◽  
Eman R. Kamel
Keyword(s):  
Dairy Cows ◽  
Dairy Cow ◽  
Genetic Factors ◽  
Dairy Farms ◽  
Dry Period ◽  
Feed Cost ◽  
Holstein Friesian ◽  
Net Profit ◽  
Main Factors ◽  
Days Open

Background and Aim: Milk yield (MY) is one of the main factors that affect the economic profitability of dairy farms. Thus, increasing the MY per animal and decreasing the feed cost can lead to economic gains, so the objective of this study was to evaluate the effect of dry period length (DPL), days open (DO), and days in milk (DIM) on the productivity and profitability of dairy cow farms. Materials and Methods: Data used in this study were taken from 3095 lactation records of Friesian dairy cows of private and governmental sectors. The data were classified into 4 DPL categories: DPL1 <45 days; DPL2 45-60 days; DPL3 61-75 days, and DPL4 >75 days, 3 DO categories: DO1 ≤90 days; DO2 91-110 days and DO3 >111 days, and 8 DIM categories: DIM1 180-210 days; DIM2 211-240 days; DIM3 241-270 days; DIM4 271-300 days; DIM5 301-330 days; DIM6 331-360 days; DIM7 361-447 days; and DIM8 >447 days. Results: The average net profit (NP) was significantly different (p<0.05) among different categories of DPL, DO, and DIM in both production sectors, where high estimates of NP were calculated for DPL3 (30667.3 EGP), and it was the lowest for DPL1 (19690.6 EGP). DO2 had the highest NP (30754.1 EGP), while DO3 had the lowest NP (24875.5 EGP). DIM3 had the highest NP (29569.3 EGP), while DIM8 had the lowest NP (19528.4 EGP). Conclusion: Finally, we can conclude that DPL 61-75 days, DO 91-110 days, and DIM 241-270 days had the highest level of total MY, total return, and NP. Private dairy cow farms achieve a higher level of NP than governmental ones under subtropical Egyptian conditions.

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