PSXIV-28 Genetic correlation between level of Babesia bovis, tick count and weight gain in Braford and Hereford cattle.

AbstractThe Baluchi breed is the most common native breed of Iran adapted to harsh environments in the eastern parts of the country. The data used in the present study, collected from two research flocks at the Abbasabad sheep breeding station in north-east Iran, included 20 534 animals descended from 363 sires, 5992 dams, 282 maternal grandsires, and 2865 maternal granddams during the period 1966 to 1989. The traits recorded were: birth weight (BW), weaning weight (WW), weight at 6 months (W6), weight at 12 months (YW), pre-weaning gain (WG), post-weaning gain (PWG), lamb fleece weight (LFW), ewe fleece weight sheared before first joining (FW1) and adult ewe fleece weight (FW). Genetic parameters, estimated with restricted maximum likelihood and a two-trait animal model, were similar in the two flocks. Direct heritabilities for the various body weight traits were moderate and varied between 0·13 and 0·32, while the maternal heritabilities were low and varied between 0·01 and 0·12. Direct and maternal genetic correlations between WW and weights at later ages were moderate to high (0·59 to 0·96). Direct heritabilities of weight gain measures varied between 0·12 and 0·19, while no significant maternal influence on either of these weight gain measures could be detected. The estimates of direct genetic correlation between WG and PWG were positive and varied between 0·54 and 0·74, while negative maternal genetic correlation (0·17 on average) between WG and PWG was detected. For LFW, direct heritability was low and no maternal heritability could be shown. For FW1, both direct and maternal genetic influences were demonstrated (0·07 to 0·26). Direct genetic correlation between LFW and FW1 was very low and close to zero, while maternal genetic correlation was positive and relatively high (0·72 on average). The relative contributions to phenotypic variance from variance components due to common environmental effects ranged from 0·01 to 0·15 for all traits. The repeatability of FW was low (0·03 to 0·12).

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Grassland performance of Hereford cattle selected for rate and efficiency of lean gain on a concentrate diet

Animal Science ◽

10.1017/s0003356100006346 ◽

1993 ◽

Vol 56 (3) ◽

pp. 311-319 ◽

Cited By ~ 1

Author(s):

S. C. Bishop

Keyword(s):

Weight Gain ◽

Performance Test ◽

Growth Traits ◽

Genetic Correlations ◽

Live Weight ◽

Food Conversion ◽

Live Weight Gain ◽

Lean Growth ◽

Hereford Cattle ◽

Selection For

AbstractThe performance of 273 Hereford calves from lines previously selected for lean growth rate (LGR) or lean food conversion efficiency (LFCR), on a concentrate diet, was evaluated on a grassland diet over a period of 3 years. Both bull and heifer calves were tested, and each year the performance test ran from the 1st week of May (average age of 233 days) until the 1st week of October. Carcass lean content was predicted from body weight and ultrasonic backfat depth, and lean gain was calculated from the product of live-weight gain and predicted carcass lean content. The LGR line was superior to the control (C) line for live-weight gain on test, lean gain on test and lean gain from birth until the end of test. The LFCR line performed similarly to the C line for live-weight gain on test and lean gain on test, but was inferior for total lean gain. For lean gain on test, the proportional differences between the lines were similar to those predicted from parental breeding values for LGR, but they were smaller for total lean gain. The lines did not differ significantly for either fat depth or predicted carcass lean content.Heritabilities were high for all growth traits, e.g. 0·52 (s.e. 0·17), 0·54 (s.e. 0·17) and 0·59 (s.e. 0·17) for live-weight gain on test, lean gain on test and total lean gain, but lower for fat depth and carcass lean content, 0·25 (s.e. 0·17) and 0·14 (s.e. 0·16), respectively. Genetic correlations with LGR, measured on a concentrate diet, were 0·57 for lean gain on test and 0·56 for total lean gain. If only males were considered, these correlations rose to 0·80 and 0·70, respectively. Coheritabilities between the two environments for lean growth were close to 0·3. It is concluded that although there is some evidence for genotype × environment and genotype × sex interactions, selection for lean growth on a concentrate regimen will still be effective in improving grassland performance.

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Study of relations among age at first calving, average weight gains and weights from weaning to maturity in Nellore cattle

Revista Brasileira de Zootecnia ◽

10.1590/s1516-35982010000400007 ◽

2010 ◽

Vol 39 (4) ◽

pp. 746-751 ◽

Cited By ~ 36

Author(s):

Arione Augusti Boligon ◽

Lucia Galvão de Albuquerque ◽

Maria Eugênia Zerlotti Mercadante ◽

Raysildo Barbosa Lôbo

Keyword(s):

Weight Gain ◽

Genetic Correlation ◽

Maximum Likelihood Method ◽

Selection Index ◽

Likelihood Method ◽

Average Weight ◽

Age At First Calving ◽

Nellore Cattle ◽

Estimate Heritability ◽

Selection For

Data from 23,120 Nellore animals were used to estimate genetic parameters for age at first calving, average gains from weaning to yearling and from yearling to after yearling, weaning weight, yearling weight, after yearling weight and weight at 2 and 5 years of age. Animal models were fitted by Restricted Maximum likelihood Method. Estimate heritability for age at first calving, weaning to yearling weight gain, yearling to after yearling weight gain, weight at weaning, yearling weight, after yearling weight and weight from 2 to 5 years of age were 0.17 ± 0.01; 0.23 ± 0.03; 0.25 ± 0.03; 0.28 ± 0.02; 0.26 ± 0.03; 0.30 ± 0.03; 0.32 ± 0.02 and 0.36 ± 0.04, respectively. The genetic correlation estimates between age at first calving and weight traits ranged from -0.26 to -0.14. The genetic correlation estimates between age at first calving and average gains were also negative, but higher (-0.29 and -0.32). In general, these results indicate that selection for average gains will promote changes in age at first calving and female mature weight. Improvement in reproductive performance could be obtained with the inclusion of the age at first calving in the selection index.

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0334 Genome-wide association study for tick count and infection level of Babesia bovis traits in Angus cattle

Journal of Animal Science ◽

10.2527/jam2016-0334 ◽

2016 ◽

Vol 94 (suppl_5) ◽

pp. 160-161

Author(s):

L. Cavani ◽

C. H. Santana ◽

R. Giglioti ◽

T. B. Bilhassi ◽

M. C. D. S. Oliveira ◽

...

Keyword(s):

Association Study ◽

Genome Wide Association Study ◽

Babesia Bovis ◽

Genome Wide Association ◽

Infection Level ◽

Angus Cattle ◽

Tick Count ◽

Genome Wide

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Effects of field infestations of gastrointestinal helminths and of the cattle tick (Boophilus microplus) on growth of three breeds of cattle

Australian Journal of Agricultural Research ◽

10.1071/ar9720177 ◽

1972 ◽

Vol 23 (1) ◽

pp. 177 ◽

Cited By ~ 47

Author(s):

HG Turner ◽

AJ Short

Keyword(s):

Body Weight ◽

Weight Gain ◽

Boophilus Microplus ◽

Cattle Tick ◽

Gastrointestinal Helminths ◽

Tick Count ◽

Helminth Eggs ◽

Breed Difference ◽

The Difference ◽

Tick Resistance

Approximately equal numbers of Shorthorn x Hereford (British), Africander x British, and Brahman x British yearlings (all F3-F4 generations), totalling 117, were run together on one pasture. One-third of each breed type was dipped every 3 weeks to control ticks, one-third was given injectable tetramizole at the same intervals to control gastrointestinal helminths, and one-third was untreated. The estimated increases in gains in body weight in 27 weeks due to dipping were 10 kg (10%) in Africander cross and 3 kg (3%) in Brahman cross animals (neither significant), but 27 kg (46%) in Shorthorn–Herefords (P 0.001). Anthelmintic treatment increased gains by 22 kg (22%) in the Africander cross (P < 0.001), and 1 kg (1%) in the Brahman cross group (not significant), and 18 kg (30%) in the Shorthorn–Herefords (P < 0.01). The differential breed responses to the presence of ticks were accounted for by differences in the numbers of female ticks maturing. The Africander and Brahman cross animals carried a mean of 20–30 ticks per side ompared with75–100 on Shorthorn–Herefords, and had higher repeatability of counts on individual animals. The regression of weight gain on tick count between animals within infested groups was similar to that between infested and dipped groups. There was no breed difference in counts of helminth eggs in faeces. There were significant differences between animals but they were not correlated with weight gain. Tick burdens were moderately high. Helminth egg counts were low. In these circumstances and under the pasture conditions represented, tick resistance accounted for 40% of the superiority in growth of the Brahman cross or Africander cross over Shorthorn–Herefords, and tolerance of helminths accounted for none of the difference between Africander cross and Shorthorn–Herefords, for 25–40% of the difference between Brahman cross and Shorthorn–Herefords, and for more than the observed difference between Brahman and Africander crosses. The effects of both parasites on growth, and the importance of differential responses of breeds, are conditioned by environmental conditions, notably nutrition.

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Genomic Study of Babesia bovis Infection Level and Its Association With Tick Count in Hereford and Braford Cattle

Frontiers in Immunology ◽

10.3389/fimmu.2020.01905 ◽

2020 ◽

Vol 11 ◽

Author(s):

Ligia Cavani ◽

Camila Urbano Braz ◽

Rodrigo Giglioti ◽

Cintia Hiromi Okino ◽

Claudia Cristina Gulias-Gomes ◽

...

Keyword(s):

Babesia Bovis ◽

Infection Level ◽

Tick Count ◽

Genomic Study

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The Effect of Crossbreeding on Some Economic Traits for Chicks of Lohmann Chicken

Al-Qadisiyah Journal For Agriculture Sciences (QJAS) (P-ISSN 2077-5822 E-ISSN 2617-1479) ◽

10.33794/qjas.vol10.iss1.101 ◽

2020 ◽

Vol 10 (1) ◽

pp. 221-226

Author(s):

Allawi Luaibi Dagher Al-Khauzai

Keyword(s):

Weight Gain ◽

Genetic Correlation ◽

Growth Traits ◽

Genetic Correlations ◽

Animal Production ◽

Daily Weight Gain ◽

Feed Ratio ◽

Poultry Farm ◽

Economic Traits ◽

College Of Agriculture

The experiment has been conducted at the poultry farm of Al-Qadisyah University, College of Agriculture, Department of Animal Production , for the period 24/11/2018 till 10/4/2019 by using 80 hatching chicks which belong to 20 dams and 5 sires, each sire includes 16 chicks. Four chickens are put with each sire, the first sire( Leghorn) crossbreeding with dams of Lohmann , the remaining sires are local cocks ,with five Lohmann hens. The chicks of each sire divided into two replicates ,each replicate contains 8 chicks , the experiment continues for 42 days of age. The experiment aims to study the effect of sire groups on growth traits (weight at hatching , weight at 42 days of age , weight gain and daily weight gain ) Also , the effect of sire on weekly consumption feed , in addition to estimate the heritability for previous traits and the genetic correlations among these traits. The results can be summarized as follows : The overall means of weight at hatching , weigh at 42 days of age , weight gain and daily weight gain are 34.572 , 354.898 , 320.327 and 7.627 gm respectively , the sire groups appear significantly (p<05) effect on weight at hatching and weight at 42 days of age and weekly consumption seeds. Sex has significantly (p<05) effect on weight at hatching and weight at 42 days of age. The conversion feed ratio is 3.462 gm consume feed/ gm of meat. The estimated values of heritability for weight at hatching weight at 42 days of age , weight gain and daily weight gain and daily weight gain , are 0.332 , 0.55 , 0.55 and 0.56 respectively. The values of genetic correlation between weight at hatching and weight at 42 days of age and between weight at hatching and weight gain are 0.98 and 0.58 respectively.

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