The effect of positive assortative mating on genetic parameters in a simulated beef cattle population

1986 ◽  
Vol 72 (1) ◽  
pp. 76-79
Author(s):  
R. A. Kemp ◽  
B. W. Kennedy ◽  
J. W. Wilton
Keyword(s):  
Beef Cattle ◽  
Assortative Mating ◽  
Genetic Parameters ◽  
Cattle Population ◽  
Positive Assortative Mating

Mengembangkan Ayam Buras Dan Sapi Potong Untuk Meningkatkan Pendapatan Petani Kabupaten Maros

2019 ◽  
Vol 3 (2) ◽  
pp. 172
Author(s):  
Sri - Purwanti ◽  
Syamsuddin Nompo ◽  
Laily Agustina ◽  
Muh. Nur Hidayat
Keyword(s):  
Beef Cattle ◽  
Rice Straw ◽  
Dry Season ◽  
Farm Management ◽  
Family Ownership ◽  
Cattle Population ◽  
Corn Straw ◽  
Livestock Feed ◽  
Coaching Training ◽  
Meat And Eggs

The activities conducted in Maros regency Tanralili district Purnakarya village in chickens and beef cattle groups Cedde Jaya. The main source of livestock feed cows during the dry season are dry forage, rice straw, corn straw and hay crops of nuts which happened to be planted at the time of drought. Besides, leaf  Gamal is also a main feed in dry  season. Number of cattle per family ownership only 2-3  head extensively maintained. Range chicken as well as extensive maintenance, ownership on average 2-5 chicken each household group.  To increase the productivity of cattle, the team provides counseling, coaching, training and mentoring as well as providing some main of facilities such as cattle shed, biogas digester, planting banana. Results are expected in the presence of  activities is the avaibility of green forage mainly during the dry season, so that the cattle population will increase, the biogas as a fuel  alternative to kerosin and LPG gas, liquid and solid fertilizer from biogas by-product process, the increasing population of chicken qualified (meat and eggs as well as the day old chick).  Besides the problem of production is also done on the farm management. The activities is expected that will increase the incomes of farmers further improve the welfare of Maros regency. For the sustainability of the program it is necessary supervision and guidance are routinely performed by the related department along with the college.

Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models

2011 ◽  
Vol 91 (2) ◽  
pp. 305-321 ◽  
Author(s):  
Aklilu Alemu ◽  
K. H. Ominski ◽  
E. Kebreab
Keyword(s):  
Beef Cattle ◽  
Methane Emissions ◽  
Mechanistic Models ◽  
Tier 2 ◽  
Cattle Population ◽  
Production Environment ◽  
Feed Composition ◽  
Enteric Methane ◽  
Empirical And Mechanistic Models ◽  
Enteric Methane Emissions

Alemu, A. W., Ominski, K. H. and Kebreab, E. 2011. Estimation of enteric methane emissions trends (1990–2008) from Manitoba beef cattle using empirical and mechanistic models. Can. J. Anim. Sci. 91: 305–321. The objective of this study was to estimate and assess trends in enteric methane (CH4) emissions from the Manitoba beef cattle population from the base year of 1990 to 2008 using mathematical models. Two empirical (statistical) models: Intergovernmental Panel on Climate Change (IPCC) Tier 2 and a nonlinear equation (Ellis), and two dynamic mechanistic models: MOLLY (v3) and COWPOLL were used. Beef cattle in Manitoba were categorized in to 29 distinct subcategories based on management practice, physiological status, gender, age and production environment. Data on animal performance, feeding and management practices and feed composition were collected from the literature as well as from provincial and national sources. Estimates of total enteric CH4 production from the Manitoba beef cattle population varied between 0.9 and 2.4 Mt CO2 eq. from 1990 to 2008. Regardless of the type of models used, average CH4 emissions for 2008 were estimated to be 45.2% higher than 1990 levels. More specifically, CH4 emissions tended to increase between 1990 and 1996. Emissions were relatively stable between 1996 and 2002, increased between 2003 and 2005, but declined by 13.2% between 2005 and 2008, following the same trend as that observed in the beef cattle population. Models varied in their estimates of CH4 conversion rate (Ym, percent gross energy intake), emission factor (kg CH4 head−1 yr−1) and CH4 production. Total CH4 production estimates ranged from 1.2 to 2.0 Mt CO2 eq. for IPCC Tier 2, from 0.9 to 1.5 Mt CO2 eq. for Ellis, from 1.3 to 2.1 Mt CO2 eq. for COWPOLL and from 1.5 to 2.4 Mt CO2 eq. for MOLLY. The results indicate that enteric CH4 estimates and emission trends in Manitoba were influenced by the type of model and beef cattle population. As such, it is necessary to use appropriate models for reliable estimates for enteric CH4 inventory. A more robust approach may be to integrate different models by using mechanistic models to estimate regional Ym values, which may then be used as input for the IPCC Tier 2 model.

scholarly journals Estimation of genetic parameters using a random regression monthly test-day model in an Ethiopian dairy cattle population

2016 ◽  
Vol 50 (1) ◽  
pp. 64-70 ◽  
Author(s):  
Gebregziabher Gebreyohannes ◽  
Skorn Koonawootrittriron ◽  
Mauricio A. Elzo ◽  
Thanathip Suwanasopee
Keyword(s):  
Dairy Cattle ◽  
Genetic Parameters ◽  
Random Regression ◽  
Cattle Population ◽  
Estimation Of Genetic Parameters

scholarly journals Program Siwab untuk Meningkatkan Populasi Sapi Potong dan Nilai Ekonomi Usaha Ternak

2018 ◽  
Vol 35 (2) ◽  
pp. 125 ◽  
Author(s):  
S. Rusdiana ◽  
NFN Soeharsono
Keyword(s):  
Beef Cattle ◽  
Program Implementation ◽  
Artificial Insemination ◽  
Economic Value ◽  
Cattle Population ◽  
Cattle Breeding ◽  
Study Approach ◽  
Long Run ◽  
Self Sufficiency ◽  
The Government

<p>Siwab or its extension Mandatory cattle breeding is a manifestation of government commitment in increasing beef cattle population, and as a target for meat sufficiency in 2026. The program is believed to lead Indonesia to achieve beef self-sufficiency in the next 5-10 years. Beef cattle can be maximized in order to produce calves, and become a government’s focused program on enhancing beef cattle production through artificial insemination (AI). Based on the above problems, the government hopes to develop the program, it should not fail the umpteenth time to fulfil meat needs of the country. The purpose of this review is to describe the SIWAB program and the economic value of female beef cattle produced by AI which produces calf. This study approach is done through literature reviews related to SIWAB program implementation. SIWAB program includes two main programs namely the increase of porong cattle population through artificial insemination of AI and natural mating (Inka). With the AI through prgram, the parent beef cattle can regulate the cow's birth well. The mother cow bunting AI results can increase the selling value higher and can improve the welfare of farmers. The government's policy to pursue targeted beef self-sufficiency by the year 2026 is achieved, but the program must be responded and done well. Government policy to boost short-term beef cattle population can help to meet the needs of beef consumption, and in the long run the economic impact of farmers.</p><p> </p><p>Abstrak</p><p>Program Sapi Induk Wajib Bunting (SIWAB) adalah perwujudan komitmen pemerintah dalam meningkatkan populasi sapi potong dan sebagai target untuk kecukupan daging tahun 2026. Program tersebut diyakini dapat mengantarkan Indonesia mencapai swasembada daging sapi pada 5-10 tahun ke depan. Sapi potong dapat dimaksimalkan potensinya agar dapat menghasilkan pedet, dan menjadi program pemerintah yang difokuskan untuk peningkatan produksi sapi potong melalui inseminasi buatan (IB). Berdasarkan permasalahan tersebut di atas, harapan pemerintah dengan mengembangkan program tersebut tidak boleh gagal ke sekian kalinya dalam mencukupi kebutuhan daging di dalam negeri. Tujuan tulisan review ini adalah untuk  mendiskripsikan program SIWAB dan nilai ekonomi pada usaha sapi potong betina hasil IB yang menghasilkan pedet. Kajian ini merupakan studi pustaka melalui review berbagai referensi terkait pelaksanaan program SIWAB. Program SIWAB mencakup dua program utama yaitu peningkatan populasi sapi porong melalui inseminasi buatan IB dan kawin alam (Inka). Program IB memungkinkan mengatur kelahiran anak sapi dengan baik. Sapi induk bunting hasil IB dapat meningkatkan nilai jual lebih tinggi dan dapat meningkatkan kesejahteraan peternak. Kebijakan pemerintah adalah untuk mengejar swasembada daging sapi yang ditargetkan sampai tahun 2026 bisa tercapai, namun program tersebut harus direspon dan dikerjakan dengan baik. Kebijakan pemerintah untuk menigkatkan populasi sapi potong dalam jangka pendek bisa membantu memenuhi kebutuhan konsumsi daging sapi dan dalam jangka panjang berdampak peningkatan ekonomi peternak.</p>

21 Unravelling Transmission Ratio Distortion Across the Genome of a Crossbreed Beef Cattle Population

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 12-13
Author(s):  
Daiane C Becker Scalez ◽  
Samir Id-Lahoucine ◽  
Pablo A S Fonseca ◽  
Joaquim Casellas ◽  
Angela Cánovas
Keyword(s):  
Beef Cattle ◽  
Bayes Factor ◽  
Null Distribution ◽  
Transmission Ratio Distortion ◽  
Transmission Ratio ◽  
Snp Analysis ◽  
Cattle Population ◽  
Empirical Null Distribution ◽  
Ratio Distortion ◽  
Genomic Regions

Abstract Transmission ratio distortion (TRD) is a process when one allele from either parent is preferentially transmitted to the offspring. The identification of genomic regions affected by TRD might help in the detection of lethal alleles or potential genes affecting reproduction. Here, we investigated TRD in crossbreed beef cattle population aiming to identify genomic regions showing altered deviations in segregation that could be affecting reproduction performance. A total of 237 genotyped animals were used including 46 sires, 80 dams, and 111 parent-offspring (trios). The predominant breeds of these animals were Angus (61.83%), Simmental (18.99%), Gelbvieh (6.12%), Charolais (3.65%), Hereford (2.46%) and Limousin (1.57%). After excluding SNPs with minor allele frequency lower than 0.05 and call-rate lower than 0.90, a total of 369,902 autosomal SNPs were retained for further analyses. The SNP-by-SNP analysis was performed within a Bayesian framework using TRDscanv.2.0 software, using 100,000 iterations, with 10,000 iterations being discarded as burn-in. As table 1 shows, 33 SNPs were identified with TRD, considering a Bayes Factor (BF)≥100 and the approximate empirical null distribution of TRD at 0.01% margin error. Among them, 26 SNPs were parent-unspecific and 7 SNPs were parent-specific TRD. For parent-specific TRD, 214 were identified for sire- and 162 for dam-TRD (BF≥100). Among them, 4 SNPs were detected with sire- and dam-TRD in opposite direction of preference of transmission. Preliminary functional and positional analysis was performed using the list of TRD regions with BF≥100 and the approximate empirical null distribution of TRD at 0.01% margin error. For sire-TRD, 14% of the identified QTL (n = 254) were related to non-return rate. For dam-TRD, 21 regions related to conception rate were found (1.5%) and 13 regions related to stillbirth (0.93%). Haplotype analysis is in progress to identify additional candidate regions and alleles with TRD to better understand this phenomenon in a crossbreed beef population.

Genetic Parameters in Straightbred and Crossbred Beef Cattle

1970 ◽  
Vol 31 (4) ◽  
pp. 656-663 ◽  
Author(s):  
R. J. Dunn ◽  
W. T. Magee ◽  
K. E. Gregory ◽  
L. V. Cundiff ◽  
R. M. Koch
Keyword(s):  
Beef Cattle ◽  
Genetic Parameters

scholarly journals Sexual Size Dimorphism and Positive Assortative Mating in Alpine Choughs (Pyrrhocorax graculus)

The Auk ◽  
2001 ◽  
Vol 118 (2) ◽  
pp. 553-556 ◽  
Author(s):  
Anne Delestrade
Keyword(s):  
Sample Size ◽  
Assortative Mating ◽  
Body Condition ◽  
Sexual Size Dimorphism ◽  
Morphological Characters ◽  
Positive Trend ◽  
Tarsus Length ◽  
Size Dimorphism ◽  
Positive Assortative Mating ◽  
Larger Sample

Abstract The degree of sexual size dimorphism in a number of different morphological characters was examined in a social corvid, the Alpine Chough, using measurements taken on 178 males and 144 females. A small amount of size dimorphism appeared in all morphological characters, and weight was the most dimorphic character. To identify if Alpine Choughs mate assortatively, measurements of mates were compared in 76 pairs. A positive assortative mating was found on tarsus length, and a small positive trend is suggested between body condition of partners, but that needs to be confirmed with a larger sample size.

scholarly journals An Evaluation of Historical Trends in New Mexico Beef Cattle Production in Relation to Climate and Energy

2019 ◽  
Vol 11 (23) ◽  
pp. 6840 ◽  
Author(s):  
Ashraf Zaied ◽  
Hatim Geli ◽  
Jerry Holechek ◽  
Andres Cibils ◽  
Mohammed Sawalhah ◽  
...  
Keyword(s):  
New Mexico ◽  
Beef Cattle ◽  
Crude Oil ◽  
Production Systems ◽  
Oil Production ◽  
Mean Annual Temperature ◽  
Cattle Population ◽  
Cattle Production ◽  
Crude Oil Production ◽  
Beef Cattle Production

In support of Food-Energy-Water Systems (FEWS) analysis to enhance its sustainability for New Mexico (NM), this study evaluated observed trends in beef cattle population in response to environmental and economic changes. The specific goal was to provide an improved understanding of the behavior of NM’s beef cattle production systems relative to precipitation, temperature, rangeland conditions, production of hay and crude oil, and prices of hay and crude oil. Historical data of all variables were available for the 1973–2017 period. The analysis was conducted using generalized autoregressive conditional heteroscedasticity models. The results indicated declining trends in beef cattle population and prices. The most important predictors of beef cattle population variation were hay production, mean annual hay prices, and mean annual temperature, whereas mean annual temperature, cattle feed sold, and crude oil production were the most important predictors for calf population that weigh under 500 lb. Prices of beef cattle showed a strong positive relationship with crude oil production, mean annual hay prices, rangeland conditions, and mean annual precipitation. However, mean annual temperature had a negative relationship with mean annual beef prices. Variation in mean annual calf prices was explained by hay production, mean annual temperature, and crude oil production. This analysis suggested that NM’s beef cattle production systems were affected mainly and directly by mean annual temperature and crude oil production, and to a lesser extent by other factors studied in this research.

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