scholarly journals FACTORS AFFECTING REPRODUCTIVE TRAITS IN SEVERAL BREEDS OF DAIRY CATTLE IN IRAQ

2020 ◽  
Vol 51 (2) ◽  
pp. 629-636
Author(s):  
Hermiz & Hadad
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Dairy Cattle ◽  
Regression Coefficient ◽  
Reproductive Traits ◽  
Calving Interval ◽  
Lactation Period ◽  
Season Of Birth ◽  
Factors Affecting ◽  
Significant Regression

This study aimed to investigate the factors affecting reproductive traits using records collected during two calving seasons (2016-2017) and (2017-2018) from three herds of dairy cattle bred at Erbil-Iraq, and includes 323 lactation period (LP), 159 age at first calving (AFC) and 159 calving interval (CI). GLM within SAS used to diagnose the significance effects of the available factors affecting the studied traits. Repeatability of LP also estimated. Overall mean of LP, AFC and CI for the three breeds in all herds were 300.14 days, 27.709 months, and 360.26 days respectively. Simmental recorded significantly (p<0.01) higher LP (302.95 days) comparing with Friesian (296.81 days) and Bokane (293.24 days). Differences in LP due to the herd were significant (p<0.01). LP decline significantly (p<0.01) from 306.05 days in the 1st parity to 290.22 days in the 4th parity. Effects of year and season of calving on LP were not significant. Cows calved females had significantly longer LP (299.39 days) than cows calved males (295.95 days). Regression of LP on AFC (0.207 day/mo.) was not significant, while regressions on body weight of cow at calving (0.088 day/kg) and on birth weight of their calfs (1.661 day/kg) were significant. Repeatability estimate for LP was 0.55. Differences in AFC due to the breed were highly significant, while the effect of herd, year and season of birth were not significant. Regression of AFC on their body weight at calving was not significant (-0.01 day/kg). Differences among the breeds, herds and parities in their CI were not significant. Cows calved in winter and spring recorded significantly shorter CI as compared with those calved in summer and autumn. Regression coefficient of CI on AFC (0.692 day/mo.) was not significant, while the regression on body weight of cow at calving (0.151 day/kg) was highly significant.

scholarly journals Factors affecting the milk production of dairy cattle in northern rural areas of Bangladesh

2015 ◽  
Vol 4 (2) ◽  
pp. 41-45 ◽  
Author(s):  
MR Begum ◽  
M Anaruzzaman ◽  
MSI Khan ◽  
M Yousuf
Keyword(s):  
Body Weight ◽  
Dairy Cattle ◽  
Milk Production ◽  
Rural Areas ◽  
Binary Logistic Regression ◽  
Cross Sectional Study ◽  
Lactation Period ◽  
Cross Sectional ◽  
Age At First Calving ◽  
Factors Affecting

A cross sectional study was conducted to observe the factors affecting the productive performance of dairy cattle from northern rural areas of Bangladesh during July and September 2013. Data of 105 cows, 85 (80.95%) from local and 20 (19.05%) cows from cross breed, were randomly selected for the study. A binary logistic regression, expressed by odds ratio with 95% confidence interval, was done to determine the association of daily milk production categorized into ? 2 and > 2 liters (L), based on median, with the significant explanatory variables of body weight, age at first calving, lactation period, vitamin use, type of floor and milking person. The result demonstrated that the probability of milk production of >2 L was 6.16, 4.5, 20.65 and 5.7 times higher from the with animal body weight of >140 kg, age at first calving of >36 m, lactation period of >8 m and vitamin use than that of body weight of 140 kg, age at first calving of ?36 m, lactation period of ? 8 m, and not vitamin used respectively. The chance of milk production of > 2 L was 0.25 and 0.22 times lower for mud floor, and owner milking than that of brick floor and gowala (professional milking person) respectively. DOI: http://dx.doi.org/10.3329/ijarit.v4i2.22646 Int. J. Agril. Res. Innov. & Tech. 4 (2): 41-45, December, 2014

Factors affecting body weight at birth and at 90 days of age in pure-bred and cross-bred cattle in a tropical environment

1972 ◽  
Vol 78 (2) ◽  
pp. 227-231 ◽  
Author(s):  
M. B. Willis ◽  
P. D. P. Wood ◽  
A. Kaspar
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Genetic Correlations ◽  
Tropical Environment ◽  
Seasonal Effect ◽  
General Tendency ◽  
Season Of Birth ◽  
Factors Affecting ◽  
Brown Swiss ◽  
Sex Effects

SUMMARYLive weights of 8764 calves born in seven herds in Cuba during the years 1966–8 were measured at birth and at approximately 3 months of age. Over 2600 were pure bred: Zebu (2002), Santa Gertrudis (435) and Charolais (212); the remainder were crossbred Holstein x Zebu (4955) and Brown Swiss x Zebu (1160).Year, season of birth, herd and sex were associated with variation in mean birth weight in all breeds and crosses except Charolais in which no seasonal effect was apparent and in Brown Swiss x Zebu cross-breeds in which herd and sex effects were absent.At 90 days there was a general tendency for calves born in late spring and summer to be heavier than those bom at other times. By this age, herd variation had subsided among Brown Swiss x Zebu cross-breds, and variation due to sex had ceased to be important among Charolais calves.Estimates of heritability of birth weight ranged from 0·09 in Holstein crosses to 0·62 in Brown Swiss crosses, and of weight at 90 days from 0·05 in Brown Swiss crosses to 0·44 in the Charolais breed. Phenotypic correlations between birth and 90 days weights were of the order of + 0·25 while genetic correlations were positive for pure breeds and negative for cross-breeds.

scholarly journals Factors Affecting Birth Weight And Growth Rate In Friesian X Bunaji Calves

2021 ◽  
Vol 19 ◽  
pp. 101-106
Author(s):  
O. W. Ehoche ◽  
A. E. O. Malau-aduli ◽  
B. Y. Abubakar
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Birth Weight ◽  
Significant Influence ◽  
Season Of Birth ◽  
Correction Factors ◽  
Wet Season ◽  
Factors Affecting ◽  
Body Weights ◽  
The Mean

Calving records from 1984 - 1989 were studied to determine the influence of rearing method, sex of calf, season of birth, dam breed and year of birth on body weight at birth, 3,6 and 12 months of age in Friesian x Bunaji calves. The mean weights of calves at birth, 3, 6 and 12 months of age were 22.0, 68.2, 96.7 and 137.4 kg, respectively. Sex of calf had a significant effect, with male calves being heavier than the females by 1.2, 5.9 and 9.7 kg at birth, 3 and 6 months of age respectively. The effect of season of birth on calf body weights was not significant except at 6 months of age, when calves born during the wet season were heavier (P<0.01) than those born in the harmattan period by 9.5 kg. Year of birth had a highly significant effect (P<0.01) on calf weights from birth to yearling. Method of rearing and dam breed had no significant influence on all the weights. The results suggest the need to develop correction factors for standardisation of weight records when comparing dams on the basis of body weights of their calves.

scholarly journals Maternal inheritance on reproductive traits in Brangus-Ibagé cattle

2004 ◽  
Vol 34 (4) ◽  
pp. 1163-1167 ◽  
Author(s):  
Luis Ernani Henkes ◽  
Magda Vieira Benavides ◽  
João Francisco Coelho Oliveira ◽  
José Carlos Ferrugem Moraes ◽  
Tania Azevedo Weimer
Keyword(s):  
Birth Weight ◽  
Heritability Estimate ◽  
Reproductive Traits ◽  
Direct Selection ◽  
Calving Interval ◽  
Age At First Calving ◽  
Linear Effect ◽  
Mtdna Mutations ◽  
D Loop ◽  
Additive Genetic Effects

Cytoplasmic inheritance influence on reproductive traits was investigated in the Brangus-Ibagé cattle (3/8 Nelore x 5/8 Aberdeen Angus). Additive genetic effects were responsible for 12% ± 11% of phenotypic variation observed in first calving interval, but their contribution dropped to zero when all calving intervals (CI) were considered. The heritability estimate for age at first calving (AFC, in days) was 0.19 ± 0.09. Mitochondrial lineage (MIT) had negligible effects on phenotypic variances of calving interval (0.0 ± 0.02), calf birth weight (0.0 ± 0.01), and cow weight at calving (0.0 ± 0.01). However, for the age at first calving, MIT accounted for 0.15 ± 0.07 of total variation. Cow weight at calving had a significant linear effect on CI and AFC. Three D-loop mtDNA mutations significantly affected either calving interval (T®C at sites 16,113 and 16,119) or calf birth weight (T®C at site 16,113). The C variants had decreased CI (29 and 32 days, respectively) and increased calf weight (0.6kg). Although the effects were small, direct selection for these mutation-carrier cows might improve the reproductive and developmental performance in this herd.

RELATIONSHIPS OF REPRODUCTION TRAITS, BODY WEIGHT AND MILK YIELD IN DAIRY CATTLE

1986 ◽  
Vol 66 (1) ◽  
pp. 53-65 ◽  
Author(s):  
T. R. BATRA ◽  
A. J. LEE ◽  
A. J. McALLISTER
Keyword(s):  
Body Weight ◽  
Dairy Cattle ◽  
Milk Yield ◽  
Fixed Effects ◽  
Genetic Correlations ◽  
Calving Interval ◽  
Phenotypic Correlations ◽  
Reproduction Traits ◽  
Heritability Estimates ◽  
National Cooperative

The relationships between reproduction traits, body weight and milk yield were investigated using data from 1611 heifers and 733 cows from two lines of the National Cooperative Dairy Cattle Breeding Project. The data were analyzed separately for heifers and cows within lines using a mixed linear model containing fixed effects for station, year of birth, season of birth and random effect of sires. Heritability estimates and genetic correlations were estimated by a paternal half-sib analysis. Heritability estimates for heifer and cow reproduction traits ranged between 0 and 26% while those of body weights at calving and 112 d postpartum and milk yield ranged from 24 to 43%. Heifers with difficult calving had a higher incidence of retained placenta than those with normal calving. Phenotypic correlations between heifer reproduction traits and milk yield during first lactation were small. High milk production in cows was associated with longer calving interval. Phenotypic correlations between heifer's and cow's reproduction traits were small. Difficult calving in heifers impairs reproductive performance after calving resulting in greater number of days from calving to first and last breeding and leading to a longer calving interval. Key words: Reproduction traits, heifers, cows, milk yield, dairy cattle

scholarly journals Factors Affecting Days Open, Gestation Length, and Calving Interval in Florida Dairy Cattle

1992 ◽  
Vol 75 (1) ◽  
pp. 288-293 ◽  
Author(s):  
H.M. Silva ◽  
C.J. Wilcox ◽  
W.W. Thatcher ◽  
R.B. Becker ◽  
D. Morse
Keyword(s):  
Dairy Cattle ◽  
Gestation Length ◽  
Calving Interval ◽  
Factors Affecting ◽  
Days Open

scholarly journals TEKNOLOGI EKSISTING USAHA TERNAK SAPI KELOMPOK TANI KARYA BERSAMA PADA PENDAMPINGAN PENGEMBANGAN KAWASAN PETERNAKAN KABUPATEN JAYAPURA

2020 ◽  
Vol 16 (2) ◽  
pp. 177
Author(s):  
Petrus Alexander Beding ◽  
Batseba M.W. Tiro ◽  
Ghalih P Dominanto
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
Focus Group ◽  
Data Collection ◽  
Beef Cattle ◽  
Group Discussion ◽  
Calving Interval ◽  
Breeding Area ◽  
C Value ◽  
Cattle Farms

<p class="pre" align="justify"><strong><em><span>Abstract:</span></em></strong><em><span> </span></em><em><span>Jayapura is one of </span></em><em><span>regencie</span></em><em><span>s in Papua which is designated as development of breeding area of beef cattle commodities. This study aims to present data and information </span></em><em><span>about </span></em><em><span>the profile of beef cattle farms in the Karya Bersama Farmer Group, Namblong </span></em><em><span>d</span></em><em><span>istrict, Jayapura </span></em><em><span>regency </span></em><em><span>as the location for assisting the development of breeding area of beef cattle commodities. Data collection were conducted by survey and interview to 24 farme</span></em><em><span>rs</span></em><em><span> at Kelompok Tani Karya Bersama that strengthened by F</span></em><em><span>ocus </span></em><em><span>G</span></em><em><span>roup </span></em><em><span>D</span></em><em><span>iscussion</span></em><em><span>. The demonstration plot was carried out by introducing forage processing technology into silage and fermented straw as well as additional feed (bran) and observing the level of livestock reproduction. The results showed that the level of productivity of cattle is still relatively low, where calving interval is long (18-24 months), high S/C value (2 - 4), low birth weight (15-18 kg) and changes in body weight 0.1-0.2 kg/head/day. However, the assistance of technology can improve the productivity of cattle. </span></em><em></em></p><p class="pre" align="justify"> </p><p align="justify"><strong>Abstrak: </strong>Kabupaten Jayapura merupakan salah satu kabupaten di Papua yang ditetapkan sebagai pengembangan kawasan peternakan komoditas sapi potong. Kajian ini bertujuan untuk menyajikan data dan informasi mengenai profil usaha ternak sapi sapi potong pada kelompok tani Karya Bersama, Distrik Namblong, Kabupaten Jayapura sebagai lokasi pendampingan pengembangan kawasan peternakan komoditas sapi potong. Metode pengumpulan data dilakukan melalui survei dan wawancara langsung menggunakan kuisioner semi-struktur terhadap 24 responden peternak pada kelompok tani Karya Bersama dan dipertajam dengan <em>Focus Group Discussion</em> (FGD). Kegiatan demplot dilakukan dengan mengintroduksi teknologi pengolahan hijauan menjadi silase dan jerami fermentasi serta pakan tambahan (dedak) dan dilakukan pengamatan terhadap tingkat reproduksi ternak. Hasil kajian menunjukkan tingkat produktivitas ternak sapi masih tergolong rendah, dimana calving interval cukup panjang (18 – 24 bulan), nilai S/C tinggi (2 - 4), bobot lahir rendah (15 – 18 kg) serta perubahan bobot badan induk 0,1-0,2 kg/ekor/hari. Namun dengan adanya pendampingan teknologi dapat memperbaiki kinerja produktivitas ternak sapi. </p>

Feeding During Pregnancy

1944 ◽  
Vol 1944 (02) ◽  
pp. 58-61 ◽  
Author(s):  
L. R. Wallace
Keyword(s):  
Body Weight ◽  
Birth Weight ◽  
List Type ◽  
Lactation Period ◽  
Rate Of Growth ◽  
Pregnant Ewe

To show the importance of the level at which the pregnant ewe is fed in relation to : (1)The birth weight of her offspring, (2)The volume of milk which she produces during her lactation period, (3)The influence of these two upon the rate of growth of the lambs, two experiments were carried out. In the first, a group of 4-year-old Border Leicester × Cheviot ewes from the same flock were mated to the same Suffolk ram. They were then split into two uniform groups. The ewes were fed individually and after service both lots were fed just sufficient sainfoin hay to keep them at constant body weight. Then, six weeks before lambing, the members of one group were given ½ lb. of concentrate daily and as much hay as they would eat. Upon this ration these ewes gained an average of 44 lb. At the same time the amount of hay fed to the second group was reduced so that over the last six weeks these ewes lost on the average 11 lb. weight.

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