Results 141 to 150 of about 2,018,275 (336)

CALVING INTERVAL IN CROSSBRED ZEBU CATTLE

, 2007
O trabalho apresenta o estudo de 296 dados de intervalos entre partos em gado azebuado do planalto central de Goiás, município de Anápolis. Observou-se que o intervalo médio entre partos foi de 17,37 +/- 0,24 meses.
Galvão, Francisco Eduardo, Pato, José Magno, Marcelino Sobrinho, José   +2 more
openaire   +1 more source

Genetic Parameter Estimation for Pregnancy Loss and Their Association With Reproductive and Growth Traits in Brahman Cattle Under Extensive Tropical Conditions

Journal of Animal Breeding and Genetics, EarlyView.
ABSTRACT This study estimated genetic parameters for pregnancy loss (PL) in Brahman cattle and evaluated the genetic correlation of PL with growth and reproductive traits using both the pedigree relationship matrix (A) and pedigree plus genomic relationship matrix (H). Data were collected from two herds in Bolivia, focusing on three age groups: heifers,
Daniel Cardona‐Cifuentes, Lucia G. de Albuquerque, Milagros Arias, Sindy Caivio‐Nasner, Luis Camaripano, Luis G. Gonzalez‐Herrera, Patricia I. Schmidt, Fernando Baldi   +7 more
wiley   +1 more source

Stayability in the Era of Early‐Challenged Females: Genetic Parameters and Correlations With Economically Relevant Traits

Journal of Animal Breeding and Genetics, EarlyView.
ABSTRACT This study aimed to estimate the variance components, heritabilities and genetic correlations between four new different categories of stayability (STAY48‐2, STAY48‐3, STAY54‐2, STAY54‐3) with weight at 240 days of age (W240), weight at 450 days of age (W450), scrotal circumference at 365 days of age (SC365), age at puberty in males (APM ...
Letícia Silva Pereira, Larissa Bordin Temp, Gabriel Gubiani, Miller Teodoro, Cláudio Ulhoa Magnabosco, Fernando Baldi   +5 more
wiley   +1 more source

Factors Affecting Holstein Cattle Fertility Traits in the Slovak Republic

Scientific Papers Animal Science and Biotechnologies, 2023
We investigated the influence of the factors herd-year, breed-type, sire, and milk production and lactation length on the fertility traits of Holstein cattle (age at first calving, calving interval, days open, non return rate at 56, 72, and 90 day).
Zuzana Riecka, Juraj Candrák, Eva Strapáková   +2 more
doaj  

Calving Intervals in Scotland’s Cattle Population: Conditionality Options

, 2023
The Scottish Government is committed to developing a future framework of direct agricultural support payments with enhanced conditionality attached. Particular attention is being paid to reducing greenhouse gas emissions from the beef herd. Calving Interval is a key efficiency metric for beef production, along with heifer calving age, mortality rates ...
Thomson, SG, Archibald, ID, Lawson, MFL, Coffey, MP, Moxey, Andrew P, Geraghty, TEG   +5 more
openaire   +1 more source

Application of Genomic Random Regression Models for Genetic Parameter Estimations of Female Fertility Traits in Different Parities in German Holsteins

Journal of Animal Breeding and Genetics, EarlyView.
ABSTRACT The aim of the present study was to infer genetic (co) variance components and to estimate parity‐specific breeding values for the female fertility traits non‐return rate after 56 days, the interval from calving to first service and days open by applying random regression models on a time‐dependent parity scale. In this regard, we considered a
Sina Sakhaei‐far, Tong Yin, Sven König   +2 more
wiley   +1 more source

Evaluation of Level of Milk Potential on Nutrient Balance in 2- and 4- Year- Old May- Calving Range Cows Grazing Sandhills Upland Range [PDF]

, 2020
A modeling study evaluated the effects of milk production level on nutrient balance in May- calving cows grazing Sandhills upland range during the breeding season. Forage quality of upland range peaks in June and steadily declines in July until November.
Adams, Don C., Mulliniks, J. Travis
core   +1 more source

Effect of Anti-Mullerian Hormone, Metabolic Profile and Mineral Levels at Transition Period On The Calving – Conception Interval in Cows

, 2023
Mustafa İleritürk, Özgür Kaynar
openalex   +2 more sources

Genetic Parameter Estimation for Plasma Biomarkers Associated With Energy Reserves During Critical Physiological Stages in Sheep

Journal of Animal Breeding and Genetics, EarlyView.
ABSTRACT The ability of ruminants to mobilise and restore body reserves (BR) over time, referred to as BR dynamics, is currently considered an interesting biological component to be included in breeding programs targeting enhanced BR resilience. However, genetic studies of proxies for BR levels and BRD remain scarce, particularly in small ruminants ...
Agnes Nyamiel, Andres Legarra, Didier Marcon, Christian Durand, Sébastien Douls, Gaetan Bonnafe, Anne Tesnière, Eliel González‐García, Dominique Hazard   +8 more
wiley   +1 more source

Genetic Parameters of Age at Conception in Nellore Females Using Threshold Models

Journal of Animal Breeding and Genetics, EarlyView.
ABSTRACT Age at conception is a critical factor in the intensification of production systems. It is crucial for intensifying production, optimising reproductive efficiency and boosting Nellore female productivity for genetic progress. However, the low heritability estimates currently limit the effectiveness of selection responses, thereby underscoring ...
Raimundo Nonato Colares Camargo Júnior, Cláudio Vieira de Araújo, Marina de Nadai Bonin Gomes, Feliciano Benedetti de Freitas, Welligton Conceição da Silva, Simone Inoe de Araújo, Éder Bruno Rebelo da Silva, Alison Miranda Santos, José Ribamar Felipe Marques, José de Brito Lourenço‐Júnior, André Guimarães Maciel e Silva   +10 more
wiley   +1 more source