Milk production per cow and per hectare of spring-calving dairy cows grazing swards differing in Lolium perenne L. ploidy and Trifolium repens L. composition

McClearn, B.; Gilliland, T. J.; Delaby, Luc; Guy, C.; Dineen, Michael; Coughlan, F.; McCarthy, B.

doi:10.3168/jds.2018-16184

Cited by 16 publications

(19 citation statements)

References 49 publications

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“…Reproductive Performance. Grazing treatment did not affect animal reproductive performance or func-tional traits and is reported in a separate publication (McClearn et al, 2019). The reproductive performance of the 3 genotypes is shown in Table 5, with only 2 parameters showing a significant difference between genotypes.…”

Section: Genotype Responsesmentioning

confidence: 79%

“…The experiment was conducted at Teagasc Clonakilty Agricultural College (51°63′N, −08°85′E; 25-70 m above sea level) over 4 yr from 2014 to 2017. A randomized block design was used, with a 2 × 2 factorial arrangement of 2 perennial ryegrass (PRG; Lolium perenne L.) ploidies (tetraploid and diploid), each sown with and without white clover (Trifolium repens L.), to give 4 separate grazing treatments as described by McClearn et al (2019): a tetraploid PRG-only sward, a diploid PRG-only sward, a tetraploid PRG sward with white clover, and a diploid PRG sward with white clover. The grazing area was subdivided into 4 separate farmlets, 1 for each grazing treatment.…”

Section: Methodsmentioning

confidence: 99%

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An assessment of the production, reproduction, and functional traits of Holstein-Friesian, Jersey × Holstein-Friesian, and Norwegian Red × (Jersey × Holstein-Friesian) cows in pasture-based systems

McClearn

Delaby

Gilliland

et al. 2020

Journal of Dairy Science

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Pasture-based production systems typically require highly fertile, healthy, and robust genetics, with greater emphasis on milk solids (MSo; kg of fat + protein) production as opposed to milk yield. This study assessed milk production, production efficiency, reproductive performance, body weight (BW), body condition score, and functional traits in 3 different dairy cow genotypes: Holstein-Friesian (HF), Jersey × Holstein-Friesian (JEX), and Norwegian Red × (Jersey × Holstein-Friesian) (3-way). The 3 genotypes were rotationally grazed on 4 different grazing treatments after calving in spring and were stocked at a rate of 2.75 cows/ha. Holstein-Friesian cows produced higher daily and total milk yields compared with JEX and 3-way cows (5,718 vs. 5,476 and 5,365 kg/cow, respectively). However, JEX and 3-way cows had higher milk fat and protein contents (4.86 and 4.75%, respectively, for JEX and 3.87 and 3.88%, respectively, for 3-way) compared with HF (4.52 and 3.72%), resulting in similar MSo yield for JEX and HF (469 and 460 kg/cow) and slightly lower MSo yield for 3-way (453 kg/cow) compared with JEX. As parity increased, milk and MSo yield per cow increased. Reproductive performance was not significantly different between the 3 genotypes, which had similar 24-d submission rates, 6-wk pregnancy rates, and overall pregnancy rates over the 4-yr period. No difference in calving difficulty, incidence of mastitis, or incidence of lameness was observed among the 3 genotypes. Body weight was significantly different among all 3 genotypes, with HF being the heaviest followed by 3-way and JEX (530, 499, and 478 kg, respectively), and 3-way cows had a higher body condition score throughout lactation compared with HF and JEX cows. The differences in BW coupled with similar MSo production resulted in JEX cows having the highest production efficiency (4.58 kg of MSo/kg of metabolic BW), 3-way cows being intermediate (4.30 kg of MSo/kg of metabolic BW), and HF cows having the lowest (4.16 kg of MSo/kg of metabolic BW). In conclusion, HF herds with poor reproductive performance and low milk fat and protein contents are likely to benefit considerably from crossbreeding with Jersey, and all herds are likely to benefit in terms of production efficiency. However, where herd performance, particularly in relation to reproductive performance, is comparable with HF in the current study, crossbreeding with Jersey or Norwegian Red is unlikely to lead to significant improvements in overall herd performance.

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Section: Genotype Responsesmentioning

confidence: 79%

Section: Methodsmentioning

confidence: 99%

An assessment of the production, reproduction, and functional traits of Holstein-Friesian, Jersey × Holstein-Friesian, and Norwegian Red × (Jersey × Holstein-Friesian) cows in pasture-based systems

McClearn

Delaby

Gilliland

et al. 2020

Journal of Dairy Science

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“…The design of the 4-yr study along with the production and reproduction data used in the analysis of the 2 sward types and 3 genotypes were previously reported by McClearn et al (2019). As described by McClearn et al (2019), 4 sward types were evaluated: a tetraploid PRG-only sward, a diploid PRG-only sward, a tetraploid PRG sward with white clover, and a diploid PRG sward with white clover. Sward white clover content was 23% on average over the 4-yr period for the tetraploid PRG with white clover and the diploid PRG with white clover swards.…”

Section: Production Study Detailsmentioning

confidence: 99%

“…Milk production, BW, and BCS from the 4-yr study are shown in Table 2 and were used for the economic modeling (McClearn et al, 2019). Reproductive performance is not presented because it did not differ significantly between sward type or cow genotype.…”

Section: Production Study Detailsmentioning

confidence: 99%

“…Enriquez-Hidalgo et al (2014) and Guy et al (2018) reported increased pasture production and utilization with PRG-white clover swards compared with PRG-only swards at similar N fertilizer rates. Recent research has also re-emphasized the beneficial effects of white clover inclusion in PRG swards on animal performance, as dairy cows grazing PRG-white clover swards can have higher milk yields compared with cows grazing PRG-only swards (Egan et al, 2018;McClearn et al, 2019). Schils et al (2000) reported that gross margin was higher per farm and per cow (although not per hectare) on PRG-white clover swards fertilized with low N compared with PRG-only swards fertilized with higher N. In contrast, Humphreys et al (2012) reported similar net margin per hectare for PRG-only swards receiving high levels of artificial N compared with PRG-white clover swards receiving reduced N fertilizer annually.…”

Section: Introductionmentioning

confidence: 99%

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An economic comparison of pasture-based production systems differing in sward type and cow genotype

McClearn

Shalloo

Gilliland

et al. 2020

Journal of Dairy Science

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The objective of this study was to compare the economic performance of 2 sward types [perennial ryegrass (PRG; Lolium perenne L.) sown with or without white clover (Trifolium repens L.)] grazed by 3 cow genotypes. Physical performance data were collected from a 4-yr systems experiment based at Clonakilty Agricultural College, Clonakilty, Co. Cork, Ireland. The experiment compared 2 sward types (PRG-only swards and PRG-white clover swards), with each sward type being grazed by cows from 3 genotypes [Holstein-Friesian (HF), Jersey × HF (JEX), and Norwegian Red × JEX (3-way)]. All systems were stocked at 2.75 cows/ha with fixed fertilizer applications and concentrate supplementation. The data supplied 6 production systems (2 sward types × 3 cow genotypes). The production systems were modeled using the Moorepark Dairy Systems Model (stochastic budgetary simulation model) under 2 scenarios, one in which land area was fixed and one in which cow numbers were fixed. The analysis was completed across a range of milk prices, calf prices, and reseeding programs. The analysis showed that in the fixed-land scenario with a milk price of €0.29/L, adding white clover to PRG swards increased profitability by €305/ha. In the same fixed-land scenario, JEX cows were most profitable (€2,606/ha), followed by 3-way (€2,492/ha) and HF (€2,468/ha) cows. In the fixed-cow scenario, net profit per cow was €128 greater for PRGwhite clover swards compared with PRG-only swards. In this scenario, JEX was the most profitable per cow (€877), followed by HF (€855) and 3-way (€831). The system that produced the highest net profit was JEX cows grazing PRG-white clover swards (€2,751/ha). Regardless of reseeding frequency or variations in calf value, JEX cows grazing PRG-white clover swards consistently produced the highest net profit per hectare.

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Modelling potential human exposure to the nitrification inhibitor dicyandiamide through the environment-food pathway

Ray

Forrestal

Nkwonta

et al. 2023

Environmental Impact Assessment Review

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Milk production per cow and per hectare of spring-calving dairy cows grazing swards differing in Lolium perenne L. ploidy and Trifolium repens L. composition

Cited by 16 publications

References 49 publications

An assessment of the production, reproduction, and functional traits of Holstein-Friesian, Jersey × Holstein-Friesian, and Norwegian Red × (Jersey × Holstein-Friesian) cows in pasture-based systems

An assessment of the production, reproduction, and functional traits of Holstein-Friesian, Jersey × Holstein-Friesian, and Norwegian Red × (Jersey × Holstein-Friesian) cows in pasture-based systems

An economic comparison of pasture-based production systems differing in sward type and cow genotype

Modelling potential human exposure to the nitrification inhibitor dicyandiamide through the environment-food pathway

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